Watering instructions often use terms that can be unclear at first glance – here’s a quick translation.

Water thoroughly

Means to give water for as long and as much as it takes for the entire substrate in the pot to be moist and for excess water to drain out of the drainage hole at the bottom. The goal: water should really penetrate down to the lowest roots, instead of just moistening the top layer.

Water moderately

Means to give a smaller amount of water, so that the substrate is slightly moistened, but not completely soaked. This is often recommended for plants that are particularly sensitive to waterlogging (e.g., succulents) or during dormant periods when the overall water requirement is lower.

Why this distinction is important

Shallow, frequent watering with small amounts often causes roots to remain shallow and not develop sufficiently in depth – making the plant more susceptible to drought stress. Thorough, but less frequent watering, on the other hand, promotes a deeper, stronger root system.

Generally, early morning is usually the best choice, but evening also has its merits – depending on the situation.

Why morning is ideal

In the morning, temperatures are lower, which means less water evaporates immediately and more actually reaches the roots. Additionally, the leaves have time to dry out during the day, which reduces the risk of fungal diseases that are favored by wet leaves overnight.

When evening watering is more sensible

In extreme midday heat, if there's no time left in the morning and the plant is suffering from acute drought stress, watering in the early evening is better than not watering at all. It's important to water early enough so that the leaves can dry before nightfall.

What you should avoid

Watering in direct midday sun is the least efficient: a large part of the water evaporates before it can even penetrate the soil, and water droplets on leaves can even cause small magnifying glass effects in strong sunlight.

If the watering water seems to run directly out of the bottom of the pot unused, it's almost always due to one of two reasons – neither of which indicates a defect.

Cause 1: Hydrophobic, dried-out soil

If the substrate has been very dry for a long time, a thin waxy/fatty film forms on the soil particles (technical term: hydrophobicity or non-wetting). The water is then literally repelled and seeks the path of least resistance – usually through cracks or along the rim of the pot – instead of being absorbed over a large area.

Cause 2: Watering gap at the rim of the pot

When the soil shrinks upon drying, a small gap often forms between the soil ball and the pot wall. Water then preferentially drains through this gap without reaching the actual root ball.

What you can do

• Water in stages. First, give a small amount of water, wait 10–15 minutes for it to absorb, then the next portion. Repeat this 2–3 times, instead of watering all at once.
• Pre-spray. Lightly moistening the surface before actual watering helps to soften the repellent layer.
• Soak. For severely dried-out substrate, place the entire pot in a container of water for 20–30 minutes until no more air bubbles rise.
• Press down the rim. Gently press the soil at the rim of the pot with your fingers to close the gap between the soil and the pot wall.

How to avoid this in the future

Since hydrophobicity usually only occurs when the substrate completely dries out for too long, it helps to avoid this situation in the first place. A FYTA Sensor reliably tells you when the substrate is truly dry, before it reaches this extreme state.

Methods

Leave water standing uncovered for 24 hours, collect rainwater, use a water filter, or use distilled water for particularly sensitive plants.

Why this is important

Lime gradually shifts the pH value upwards and can hinder the absorption of important nutrients like iron.

With the FYTA pH-Kit, you can directly check if your substrate has already shifted into an unsuitable pH range due to hard watering water.

A water meter (also called a moisture meter) indicates how much moisture is currently in a plant's substrate – so you don't have to guess whether watering is needed or not.

The most common variants

Simple analog probes. A rod is inserted into the substrate and shows the approximate moisture level via a needle or color scale (usually "dry/moist/wet"). Inexpensive and simple, but without tracking over time – you have to actively measure each time.

Digital single-measurement devices. Function similarly to analog variants, but display the value as a number on a small screen. Again, this is a snapshot, not continuous monitoring.

Smart, permanently connected sensors. A FYTA Sensor remains permanently in the substrate, continuously measures instead of just spot-checking, and transmits the values in real-time to the app – including historical data over days and weeks, as well as additional measurements of light, temperature, and nutrient content. Instead of just knowing how moist it is "right now," you see the entire trend and receive an assessment tailored to your specific plant species, indicating when watering should actually occur.

Who benefits from which variant

A simple stick moisture meter can be sufficient for a quick, one-time check. However, if you want to know regularly and reliably when your plants really need water – especially with multiple plants or different locations – a permanently measuring, smart sensor like the FYTA Beam is much more beneficial than a device you have to manually insert into the soil every time.

A water level indicator (e.g., SUSTEE) remains permanently in the pot and indicates whether there is enough moisture by changing color.

The limitations

It only provides a rough yes/no information without historical data over time and without additional values like light or nutrients.

A FYTA Sensor offers much more: continuous measurement values with historical data, plus light, temperature, and nutrient content – for a more informed assessment than a simple color change.

Automatic watering systems (e.g., drip lines with timers or watering computers) have clear advantages, but also some disadvantages that should be known before purchasing.

The main disadvantages

Rigid schedules instead of actual needs. Most simple systems water on a fixed schedule – regardless of whether the substrate is actually dry or not. In case of rain, cooler weather, or varying water needs of individual plants, this can quickly lead to over or under-watering.

Technical failures often go unnoticed. Clogged nozzles, an empty water tank, or a defective pump often only become apparent in automatic systems when the plants have already visibly suffered – unlike manual watering, where you regularly keep a direct eye on the plant.

Limited flexibility for different plant needs. A system that supplies multiple plants simultaneously often treats them identically, although the actual water requirement can vary greatly depending on the species, pot size, and location.

Acquisition and maintenance costs. Depending on the system, acquisition costs, installation, and regular maintenance (cleaning hoses/nozzles, battery replacement) can entail a certain effort.

Less direct contact with the plant. Those who completely automate their watering often notice subtle signs of problems (pests, first symptoms of disease) later, as the plant is less often examined up close.

An alternative: Demand-driven instead of time-driven systems

Instead of a rigid schedule, a watering system can also be combined with actual moisture data, so that watering only occurs when necessary. A FYTA Sensor provides exactly this data – while it does not replace an automatic watering system, it gives you a reliable, continuous basis for when watering should actually occur, instead of relying on a rigid schedule.

Water requirements differ greatly depending on the plant group. This overview provides a rough guide – the actual frequency also depends on pot size, substrate, location, and season.

Why this table is only a guideline

Fixed watering schedules work only to a limited extent in practice, because factors such as room temperature, humidity, light quantity, and pot size constantly change the actual water requirement – in summer, substrate often dries out twice as fast as in winter. A FYTA Sensor measures the actual moisture directly in the substrate and tells you when your individual plant really needs water, instead of relying on a general rhythm.

Every plant has its own needs, but at its core, these can always be broken down into five basic factors: light, water, nutrients, temperature/humidity, and the right substrate.

Light

Most houseplants prefer bright, indirect light – direct midday sun can burn sensitive leaves, while too little light leads to weak, leggy growth. How much light is exactly right depends heavily on the specific species: a cactus needs significantly more direct sun than a fern.

Water

Too much or too little water are the most common reasons why houseplants suffer. Most species prefer the top layer of substrate to dry out slightly between waterings – stagnant water, however, quickly leads to root rot.

Nutrients

During the growing season (usually spring/summer), plants regularly need nutrients, especially nitrogen, phosphorus, and potassium. In autumn/winter, when growth slows down, fertilization should be reduced or paused.

Temperature and Humidity

Most houseplants feel comfortable at 18–24°C and are sensitive to drafts or direct proximity to heating. Tropical species also need higher humidity to avoid suffering from dry leaf tips.

Substrate

A well-draining, well-structured substrate is crucial so that roots can breathe and excess water drains away instead of accumulating.

Why this is so difficult in practice

The problem is rarely knowing what a plant needs – but rather continuous observation. Light changes with the seasons, substrate dries out at different rates depending on the location, and many signs of stress only become visible when it's almost too late. This is exactly where a FYTA Sensor helps: it measures moisture, light, temperature, and nutrient content directly at your plant's location and gives you an assessment tailored to the specific species, instead of you having to guess if "enough" is really enough.

Plants do not utilize the entire visible light spectrum equally efficiently for photosynthesis – certain color ranges are significantly more important than others.

The most important light colors

Blue light (approx. 400–500 nm). Primarily promotes compact, bushy growth and healthy leaf development. Plants that receive a lot of blue light tend to grow more stunted rather than shooting upwards.

Red light (approx. 600–700 nm). Is absorbed particularly efficiently by chlorophyll and plays a central role in growth, elongation, and the formation of flowers and fruits.

Green light (approx. 500–600 nm). Is mostly reflected by leaves (which is why they appear green) and is used to a lesser extent for photosynthesis.

The usable range for plants – photosynthetically active radiation (PAR for short) – roughly comprises the range from 400 to 700 nm, with red and blue having the greatest effect.

What this means in practice

Normal sunlight (and also most LED lamps with "warm white" or "neutral white" light) already contains a fairly balanced spectrum that is completely sufficient for most houseplants. Special grow lights, on the other hand, specifically rely on a higher red and blue component, often recognizable by the characteristic violet-pink shimmer of such lamps.

What matters for artificial light

For most houseplants, "sun-like," i.e., white full-spectrum light, is perfectly sufficient – plants have adapted to this natural light spectrum over millions of years. More important than the exact color composition is usually the light intensity (measured in lux) and the duration of illumination.

Light and Substrate Belong Together

Since more or more intense light generally increases a plant's water requirements (more photosynthesis means more evaporation), it is worthwhile to keep an eye on both light quantity and humidity. A FYTA sensor measures both values directly at your plant's location, so you can see how a change in location or a new grow light actually affects both factors.

Light requirements vary greatly depending on the plant species but can be roughly divided into three categories.

Guidelines by Light Requirement

Below about 500 lux, practically no significant photosynthesis occurs – the plant "survives" at best but hardly grows.

For Classification: How much Lux Arrives Where

• A sunny summer day outdoors: up to 100,000 Lux
• Directly at the window (sunny): about 2,000–3,500 Lux
• One to two meters from the window: often only 300–800 Lux

As a rule of thumb: for every meter distance from the window, you lose about 20% of the light intensity. What seems "bright" to us is often far too dark for many plants.

Why This Is Hard to Estimate

The human eye is a poor lux meter – we often perceive rooms as brighter than they actually are. A FYTA sensor measures the actual light intensity directly at your plant's location and helps you assess whether the chosen spot truly matches your plant's light requirements, instead of relying on intuition.

Hardly any term in care instructions is interpreted as differently as "sunny location" – what one person considers a bright windowsill may be far from enough for a truly sun-loving plant. A closer look at the common gradations helps avoid misunderstandings.

The Common Light Categories in Detail

Sunny or full sun location. This means that the plant receives at least 6 hours of direct, unfiltered sunlight per day – that is, sunlight that falls unimpeded through a window or directly hits the plant outdoors, without being attenuated by curtains, trees, or other obstacles. Plants that require such a location (e.g., many succulents, cacti, citrus plants, Mediterranean herbs) often show weak, leggy growth or significantly reduced flowering if they receive too little light.

Partially shaded location. Here, the plant receives direct sunlight for only a few hours (typically in the early morning or late afternoon, when the sun is less intense), but spends the rest of the day in bright, indirect light or light shade. Many popular houseplants such as Monstera, Pothos, or Calathea thrive best in this range.

Shaded location. A shaded location does not mean "dark" – the plant receives little to no direct sunlight, but should still be bright enough for sufficient light to reach it for photosynthesis. Ferns or certain Calathea species cope well with such conditions, while most other plants receive too little light here in the long run.

Why Self-Assessment So Often Goes Wrong

The human eye is surprisingly poor at objectively assessing light intensity – our vision automatically adjusts to different brightness levels, so a room can subjectively appear "bright" even though the actual measurable light intensity is far below what a sun-loving plant would need. For context: direct sunlight outdoors on a sunny summer day can reach 50,000 to over 100,000 lux. Directly at a south-facing window, values are usually only 2,000 to 10,000 lux, and just one to two meters from the window, light intensity often drops to a few hundred lux – a fraction of what many would perceive as a "sunny location."

In addition, light conditions at a location change significantly throughout the year: a window spot that is sufficiently bright in summer with a high sun angle can suddenly become a more partially shaded or even shaded location in winter, when the sun is much lower and the days are shorter, without any physical change in the plant's position.

Why This Distinction Is So Important in Practice

A misunderstanding in choosing the location is one of the most common but least obvious causes of care problems. Unlike too much or too little water, where symptoms often appear within days, chronic light deficiency often develops gradually over weeks or months – weaker growth, paler leaves, or absent flowers are then easily attributed to other causes such as nutrient deficiency, although the actual problem is simply too little light.

How to Get Objective Clarity

Instead of relying on a subjective assessment like "that looks bright enough," a FYTA sensor measures the actual light intensity in lux directly at your chosen location. The app compares this value with the actual light requirements of your specific plant species and objectively shows you whether your "sunny" estimated spot truly meets the necessary light requirements – or whether a change of location would be advisable, even before visible deficiency symptoms appear on the plant.

Plants need a total of 14 essential mineral nutrients, which can be divided into two groups: macronutrients (needed in larger quantities) and micronutrients or trace elements (needed in smaller quantities, but equally indispensable).

The Most Important Macronutrients

• Nitrogen (N): responsible for vigorous leaf growth and chlorophyll formation
• Phosphorus (P): important for root development, energy metabolism, and flowering
• Potassium (K): regulates water balance and strengthens general resistance
• Calcium (Ca): stabilizes cell walls and provides structural strength
• Magnesium (Mg): central component of chlorophyll, supports photosynthesis
• Sulfur (S): involved in many metabolic processes and protein formation

The Most Important Micronutrients

Iron, manganese, copper, zinc, boron, molybdenum, and chlorine are only needed in small quantities but are just as essential for individual metabolic functions. Iron deficiency, for example, quickly manifests as chlorosis (leaf yellowing with green veins) because iron is involved in chlorophyll formation.

Why Balance Is Crucial

Both a deficiency and an excess of individual nutrients can harm the plant – so it's not just about the presence of nutrients, but also their ratio. Additionally, the pH value of the substrate influences how well individual nutrients can be absorbed, even if they are present in the soil.

Since a nutrient imbalance often only appears late and ambiguously on the leaves, a FYTA sensor directly measures the salt content (EC value) in the substrate – a reliable indicator of whether your plant's general nutrient supply is in the green zone.

Photosynthesis

Through their leaves, plants absorb CO₂ and convert it into sugar (their energy source) using sunlight and water – oxygen is produced as a byproduct.

Minerals through the Roots

In addition, plants need mineral nutrients from the substrate water as building blocks for growth and cell structure.

Since light is the basis of energy supply, a FYTA sensor measures not only moisture and nutrients but also the actual light intensity – often the underestimated but most important factor.

Liquid Fertilizer

Acts fastest – already dissolved nutrients are absorbed directly through the roots. First effects often within days to 1–2 weeks.

Slow-Release Fertilizer (Depot Fertilizer, Sticks)

Releases nutrients continuously over weeks to months – gentler, but slower.

Organic Fertilizers (Compost, Horn Meal)

Must first be broken down by microorganisms – this often takes several weeks.

A FYTA sensor measures the EC value (nutrient content) directly in the substrate, so you can see if and how fertilization actually works, instead of just guessing.

Substrate is the technical term for the material in which a plant grows and is rooted – colloquially often simply called "soil," although the term substrate also includes materials that are not classic soil at all.

Why the Term Is Broader Than "Soil"

Not every substrate consists of soil in the classic sense. This also includes:

• Potting soil (mostly based on peat, compost, or wood fibers)
• Coir and coco fibers
• Perlite, pumice, and expanded clay (mineral, very permeable additives)
• Orchid bark (coarse bark pieces for epiphytes)
• Sphagnum moss
• Pure water (in hydroponics) or clay granules as a carrier medium

The Most Important Functions of a Substrate

• Anchorage. It provides mechanical support for the roots.
• Water retention. It holds moisture that the plant can absorb as needed.
• Air supply. A good substrate allows enough oxygen to reach the roots, which is essential for their function.
• Nutrient supply. Many substrates contain nutrients themselves or can store and release them through fertilizer.

Why the Choice of Substrate Is So Important

Different plant species have very different requirements for their substrate – a cactus needs a mineral, extremely permeable substrate, while an orchid prefers coarse, airy bark pieces and a calathea likes a finer, humus-rich substrate. The wrong substrate is a common, but often underestimated, cause of care problems, even if watering and location are otherwise appropriate.

In the FYTA app, you have a choice of countless different substrates, and you can even calibrate your very own individual substrate if you want to monitor your plant's health with a FYTA sensor.

Removing

Water beforehand (moist root ball loosens more easily), gently press/tap the pot, if heavily rooted, run a thin knife along the edge. In an emergency, cut open the pot instead of damaging the roots.

Repotting

Choose a new pot 2–5 cm larger, remove rotten roots, place at the same height as before, water moderately, and leave in a sheltered spot for a few days. Do not fertilize immediately.

After repotting, the plant is particularly sensitive. A FYTA sensor helps you keep an eye on moisture during this sensitive recovery phase, without causing additional stress from overwatering.

A scale from 0 to 14 indicating how acidic (below 7) or basic (above 7) a substrate is – 7 is neutral.

Why This Is Important for Plants

The pH value directly influences how well nutrients in the substrate can be absorbed – even with sufficient nutrients, an unsuitable pH value often blocks absorption.

With the FYTA pH Kit, the actual pH value of your substrate can be directly determined, instead of guessing if it suits your plant.

EC stands for electrical conductivity and is a measure of the amount of dissolved salts (nutrients) in the substrate water.

Why EC Is Measured Instead of Individual Nutrients

Since fertilizer consists of salts, conductivity increases proportionally with the amount of nutrients – EC is therefore a reliable overall indicator of nutrient supply.

A FYTA sensor measures the EC value directly in the substrate and shows you in the app whether your plant's nutrient supply is in the optimal range.

Commercially available potting soil for houseplants generally has a slightly acidic pH value, usually in the range of about 5.5 to 6.5.

Why Exactly This Range

Most houseplants thrive best in a slightly acidic substrate, as in this range, important nutrients – especially iron, manganese, and other trace elements – are most available to the plant. At higher (more alkaline) pH values, these nutrients are less absorbed, which often manifests as chlorosis (leaf yellowing with green veins).

Special Substrates with Deviating pH Values

• Cactus and succulent soil: similar, slightly acidic to neutral range, but with a significantly coarser, more mineral structure
• Orchid substrate: often in the range of 5.5–6.5, depending on the orchid species
• Moorland soil (for rhododendrons, azaleas, blueberries): significantly more acidic, usually around pH 4.5

How to Check the Value of Your Substrate

With a simple pH test kit or the FYTA pH Kit, the actual value can be directly determined – helpful if you are unsure whether your current soil is even suitable for a particular plant species.

Acidic soil has a pH value below 7 – in practice, it is usually referred to as "acidic" at a value below 6.0. The problem here is that many important nutrients such as nitrogen, phosphorus, or potassium are less available to plants at too low a pH value, even if they are sufficiently present in the soil – the plant simply cannot absorb them.

How to Proceed

• 1. Measure pH value. Before you do anything, you should know the actual pH value – for example, with a test strip, an electrical probe, or a test kit from a garden center.
• 2. Liming. The most common method to raise the pH value is to apply garden lime (calcium carbonate). It works slowly and gently and is sufficient with regular application every 2–3 years. For strongly acidic soil, quicklime (calcium oxide) can be used – it works faster but is more aggressive and should be dosed carefully.
• 3. Wood ash as a natural alternative. It contains potassium and calcium and moderately raises the pH value. However, you should avoid it for sensitive plants like tomatoes or berries that prefer slightly acidic soil.
• 4. Add compost. Compost improves soil structure and stabilizes pH over the long term – it doesn't replace lime, but it supports its effect.
• 5. Re-measure after 4–6 weeks and re-adjust if necessary. Important: Do not lime and use nitrogen fertilizer at the same time, as both measures can weaken each other.

The same applies to lawns

For lawns, the ideal pH value is also 6.0–7.0. Acidic lawn soil often manifests itself through increased moss growth and weakened grass growth – here too, liming is the standard solution.

Before you lime: make sure the soil is really acidic

Since incorrect liming (too much, at the wrong time, or on already neutral soil) can do more harm than good, it's worth taking a measurement before you act. With the FYTA pH-Kit, you can determine your soil's pH value directly and easily – so you'll know for sure whether and how much correction is needed, instead of liming on suspicion.

Soil acidifies when hydrogen ions (H⁺) increasingly accumulate in the soil, lowering the pH value. This doesn't happen suddenly, but is a gradual, natural process – almost every soil becomes slightly more acidic over time on its own.

The most common causes

Rain and irrigation. Rainwater is naturally slightly acidic (due to carbonic acid from CO₂ in the atmosphere) and washes calcium and other basic minerals out of the soil over time – this loss of lime lowers the pH value.

Decomposition of organic matter. The breakdown of humus, leaves, or mowing residues creates organic acids that further acidify the soil.

Plant roots and soil respiration. Both roots and microorganisms in the soil produce CO₂ during their respiration, which combines with water to form carbonic acid.

Fertilization. Mineral, nitrogen-containing fertilizers in particular can lower the pH value, as additional acids are released during the conversion of ammonium to nitrate.

Acid rain. Air pollution with sulfur and nitrogen oxides leads to precipitation with a pH value of 3–4, which also leaches lime from the soil.

Soil type. Sandy soils acidify faster than clayey soils, as they lack the buffering clay minerals that can neutralize acid for longer.

What this means for your plants

As long as the pH value remains in the appropriate range for the respective plant, this is not a problem – some species even expressly like it acidic. It only becomes critical if the pH value drops too far and nutrients are no longer available to the plant as a result. With the FYTA pH-Kit, you can regularly check the current state of your substrate and react early before acidification negatively affects your plant.

The somewhat surprising answer: most houseplants prefer a slightly acidic substrate anyway, usually in the range of pH 5.5 to 6.5 – the differences between individual species are often smaller than one might think.

However, there are some species that explicitly need acidic soil to thrive:

• Ferns (e.g., male fern, lady fern) – prefer humus-rich, permanently acidic substrate
• Azaleas (as indoor azaleas) – require a fairly low pH value of about 4.0–5.0
• Camellias – grow best in humus-rich, acidic substrate
• Orchids – many species prefer a slightly acidic substrate of bark mulch or sphagnum
• Gardenias – thrive best at a pH value below 6.5
• Bromeliads and anthuriums – also tolerate more acidic substrates
• Citrus plants (e.g., indoor lemon) – prefer slightly acidic soil for optimal nutrient absorption

How to tell if the pH value is not right

If the substrate is too alkaline for the respective plant, this often manifests itself in yellowing leaves (chlorosis), as iron and other micronutrients are less well absorbed in a too high pH range.

How to find out for sure

Instead of guessing whether your substrate is really suitable for an acid-loving plant like an orchid or azalea, you can measure the actual pH value directly with the FYTA pH-Kit – and, if necessary, help with the appropriate substrate or a slight acidification.

Alkaline soil refers to soil with a pH value above 7 – it is therefore the opposite of acidic soil. The higher the value on the scale from 0 to 14, the more alkaline (also called "basic") the soil is. Values around 9 are already considered extreme, here only very few plant species can cope.

How alkaline soil is formed

Mostly, the cause is calcareous parent rock from which the soil has formed over long periods. Frequent watering with calcareous tap water ("hard water") or an overdose of garden lime can also undesirably increase the pH value of a soil over time.

Why this can become problematic for plants

At high pH values, especially iron becomes less soluble in the soil and thus less available to the plant – even if there is enough of it in the soil. This often manifests itself in chlorosis: yellowish, sometimes almost white leaf surfaces, while the leaf veins remain green. Manganese, copper, and zinc are also less well absorbed at too high a pH value.

What you can do

• Test the pH value before taking action – a test kit provides quick clarity.
• Acidify with sulfur or acidic fertilizers to specifically lower the pH value.
• Water with rainwater instead of tap water if your tap water is very calcareous – this prevents a gradual further alkalization.
• Choose suitable plants that naturally cope well with alkaline soil, instead of fighting against the soil conditions.

With the FYTA pH-Kit, the current pH value of your substrate can be quickly determined – so you know for sure whether a correction is necessary at all, instead of acting on assumption.

While many common garden plants prefer acidic to neutral soil, there are some species that explicitly cope well with calcareous, alkaline soil (pH above 7) or even require it.

Popular plants for alkaline soil

• Lavender and rosemary. Mediterranean herbs that are naturally accustomed to calcareous, well-drained soils.
• Boxwood. A classic for hedge plantings on calcareous soils.
• Lilac (Syringa). Blooms particularly reliably on alkaline soil.
• Clematis. Prefers slightly alkaline to neutral soil.
• Brassicas (Brassicaceae) such as cabbage or arugula – they tolerate and utilize calcareous soils well.
• Chicory, field pansy, and common poppy naturally prefer to grow on calcareous soils and are considered so-called lime indicator plants.

How to tell if your soil is alkaline

A simple pH test will give you clarity about the actual value. In addition, so-called indicator plants can provide initial clues: If a lot of chicory or common poppy grows naturally in your garden, this indicates a rather calcareous soil.

Before selecting plants for alkaline soil

Since a misjudged pH value can quickly lead to bad purchases (a plant that needs acidic soil will continuously suffer in alkaline soil), a measurement in advance is worthwhile. The FYTA pH-Kit provides quick clarity here.

Some plants – such as rhododendrons, azaleas, blueberries, or hydrangeas – specifically need acidic soil to really thrive. If you want to deliberately lower the pH value of your substrate, there are several proven methods for this.

Natural, organic methods

• Pine needles and bark. Needles from pine or spruce decompose slowly and release acidic compounds – ideal as mulch or for working into the soil.
• Oak leaves. Contain tannins that acidify the soil over a longer period.
• Coffee grounds. Dried, used coffee grounds contain natural acids and can be easily worked into the top layer of the substrate.
• Peat. Works very reliably, but is problematic for environmental reasons (destruction of bogs) – peat-free alternatives such as special bog soil are now the better choice.

Faster, more targeted methods

• Elemental sulfur. Is slowly converted into sulfuric acid by soil bacteria and permanently lowers the pH value, but takes a few months for the effect to become visible.
• Iron sulfate. Works significantly faster (often within 2–3 weeks), but can cause rust stains on textiles or paths.

What you should consider

Permanent soil acidification is more a project over months than a one-time action – the natural pH value of a soil often tends to return to its original state over time, especially when watering with calcareous tap water. Therefore, water with rainwater rather than hard tap water if possible, to maintain the effect.

Before you acidify at all

Since an overdose (e.g., with sulfur or iron sulfate) can harm the roots, a measurement before and during the process is worthwhile. With the FYTA pH-Kit, you can determine the current value and track the effect of your measures over time, instead of acting on suspicion.

A plant is dead when no living cells remain that can regenerate or form new growth – meaning when roots, stems, and any remaining leaf tissue are irreversibly damaged. However, this is not always easy to recognize from the outside, as many plants appear "dead" even though they are not.

The most important signs that a plant is really dead

The stem test: Carefully scratch the bark of the stem or a branch with your fingernail or a knife. If green, moist tissue appears underneath, the plant is still alive – at least at that spot. If the tissue underneath is brown, dry, and brittle, that part has died.

Check the roots: Carefully remove the plant from its pot and examine the roots. Healthy roots are usually whitish to light brown and feel firm. Roots that are black, slimy, or mushy and smell unpleasant indicate root rot – a common reason why plants actually die.

Smell: A putrid, unpleasant smell from the substrate is a strong warning sign of dead root tissue.

What does NOT automatically mean that the plant is dead

• All leaves have fallen off: Many plants shed all their leaves under stress (drought, cold, relocation), but then sprout new ones from the roots or stem.
• The plant looks completely brown/withered: Especially with perennials or plants in winter dormancy, this can be a natural resting state rather than the end.
• No new leaves for weeks: Some plants pause their growth seasonally or after a shock, without actually being dead.

Why this is often difficult to assess

The most common mistake is to give up on a plant prematurely because the above-ground symptoms (wilting or brown leaves) appear more dramatic than the actual condition of the roots. Conversely, sometimes plants are cared for too long, even though the roots are already completely damaged – usually by waterlogging, which remains invisible from the outside until it's too late.

This is precisely what makes it so difficult to recognize early on whether a plant is truly in danger or merely in a temporary stress phase. A FYTA sensor helps you with exactly this: It continuously measures moisture, light, and temperature in the substrate and alerts you early if values are entering a critical range – often long before you would notice it on the leaves. This way, you can intervene before a stressed plant actually becomes a dead plant.

For trees, similar basic principles apply as for other plants, but with some tree-specific peculiarities due to their size and structure.

The scratch test

Carefully scratch the bark of a thinner branch or twig with a knife. If green, moist tissue (the cambium) appears underneath, that part is still alive. If the tissue is brown and dry, the branch in question has died – but not necessarily the entire tree.

Why you should test in several places

In trees, individual branches or entire canopy areas can die, while the trunk and other parts continue to live. Therefore, test several branches in different areas of the canopy before making a judgment.

Further signs

• Bark condition on the trunk: If the bark can be peeled off easily and extensively, and the area underneath is dry and crumbly, this is a serious sign.
• Lack of bud break in spring: If all buds remain closed for several weeks in spring, while comparable trees in the vicinity are already sprouting, this is a warning sign.
• Fungal fruiting bodies at the base of the trunk or on the trunk: Can indicate advanced internal rot, but are not always a sure sign of death for the entire tree.

An important difference from smaller plants

Unlike small potted plants, a partially damaged tree can recover over several years or gradually continue to die. A clear diagnosis of "dead or alive" is often more difficult for larger, older trees than for small plants and, in case of doubt, requires the assessment of an arborist, especially if a potentially unstable tree is near buildings or paths.

Yellow leaves are one of the most common warning signs in houseplants – but the cause is not always the same. Here are the most common reasons, sorted by how often they actually occur:

The most common causes

Overwatering. By far the most common cause. Too much water displaces oxygen from the substrate, the roots begin to rot and can no longer adequately supply the plant – the leaves often yellow evenly and appear slightly limp.

Underwatering. Too little water over a longer period also leads to yellowing, usually starting at the leaf edges or tips, often combined with a slightly crispy-dry texture.

Nutrient deficiency. Especially a nitrogen deficiency manifests itself through evenly yellowing, older (lower) leaves, while new leaves initially remain green – the plant specifically relocates the scarce nitrogen to the younger plant parts.

Too little light. With prolonged light deficiency, the plant cannot produce enough chlorophyll, which also manifests itself in paler, yellowish leaves.

Natural aging. Older, lower leaves yellow and fall off normally over time, while new leaves grow at the top – this is not a cause for concern in most plants, as long as it only affects individual, older leaves.

Incorrect pH value. If the substrate is too alkaline, iron is absorbed less well, which leads to chlorosis – here the leaf veins usually remain green, while the area between them yellows.

How to narrow down the cause

Pay attention to which leaves are affected (old vs. young), what the yellowing looks like (uniform vs. spotty, with or without green veins), and whether additional symptoms like wilting or dry tips are present. Since symptoms can often look similar across such varied causes, a FYTA Sensor helps narrow down the underlying problem: it shows you whether moisture, light, or nutrients (EC value) are actually outside the optimal range, instead of leaving you to guess based solely on the leaves.

Too much water is one of the most common reasons why houseplants get sick or die – and the consequences often appear gradually before becoming obvious.

What happens in the substrate

If the substrate is consistently too wet, the water displaces the air in the soil pores. However, roots need oxygen to function – without it, instead of growing, they begin to suffocate and, in the longer term, to rot.

What shows on the plant

• Root rot. The roots turn brown to black, soft and slimy, instead of remaining firm and light-colored.
• Yellow, wilting leaves. Since the damaged roots can no longer adequately supply the plant, leaves often yellow uniformly and appear droopy rather than dry.
• Musty smell from the substrate. A clear sign of rotting processes in the root area.
• Mold on the substrate surface. With persistent moisture, mold can also form.
• Stunted growth. Even without acute rot, consistently overly moist substrate can generally slow down growth, as the oxygen supply to the roots remains restricted.

Why this is often recognized too late

Unlike drought stress, which usually quickly shows up as droopy, dry leaves, overwatering often develops subtly over weeks – the roots are, after all, underground. Often, the problem only becomes visible when the damage is already advanced. With a FYTA Sensor, you can continuously monitor the actual moisture in the substrate, allowing you to intervene before the roots suffer permanent damage.

If you realize you've watered too much – recognizable, for example, by limp, yellowish leaves despite moist substrate or a musty smell from the pot – quick but thoughtful action is required.

Immediate measures

• 1. Stop watering immediately. The substrate now needs time to dry out.
• 2. Check drainage. If the pot has no drainage hole or water is standing in the cachepot, remove it immediately.
• 3. Remove the plant from the pot and inspect the roots. Healthy roots are light-colored and firm; rotten roots are brown/black, slimy, and smell unpleasant.
• 4. Trim rotten roots. Using clean, sharp scissors, remove all affected root parts until only healthy tissue remains.
• 5. Repot in fresh, dry substrate. The old, waterlogged substrate should not be reused.
• 6. Do not fertilize for now. A stressed plant should first recover before being further burdened with fertilizer.
• 7. Place in a bright, but not directly sunny spot and carefully monitor the moisture over the next few weeks.

How to avoid a recurrence

Overwatering usually doesn't result from a single "too large" watering amount, but from watering too frequently before the substrate has had a chance to dry out. A FYTA Sensor reliably indicates when the substrate is actually dry enough for the next watering – this helps avoid the problem long-term, instead of just fixing it once.

Waterlogging occurs when water in the substrate or pot cannot drain away and consequently accumulates permanently in the root area, instead of soaking in or evaporating.

How to recognize waterlogging

• Water in the cachepot or saucer that remains hours after watering
• Musty smell from the substrate
• Permanently wet, heavy substrate that feels cold and damp to the touch
• Limp, yellowish leaves despite apparently sufficient water supply
• Mold or fungal growth on the substrate surface

Why it is dangerous for plants

Waterlogging displaces air from the substrate, meaning the roots no longer receive sufficient oxygen. Without oxygen, they begin to suffocate and subsequently rot (root rot) – a condition from which many plants recover only with great difficulty.

How to avoid waterlogging

A pot with a drainage hole, a well-draining substrate, and consistently removing excess water from the cachepot or saucer are the most important basic measures. A FYTA Sensor also directly indicates if the moisture in the substrate remains consistently too high – an early warning before actual waterlogging damage develops.

Direct signs

Healthy roots are firm, whitish to light brown. Rotten roots are brown-black, soft, slimy.

Indirect signs

Musty smell, yellowish limp leaves despite moist substrate, stunted growth.

Since root rot almost always results from consistently overly moist substrate, a FYTA Sensor helps detect this early – before the roots are even damaged. Additionally, the in-app disease detection can help if above-ground symptoms are already visible.

Curled or twisted leaves are among the more common, yet also rather ambiguous, symptoms in houseplants. The good news: the way the leaf curls, and what else is observed, usually provides good clues to the actual cause.

The most common causes in detail

Too much direct sun. Many plants react to intense, direct sunlight by curling or twisting their leaves to reduce the exposed leaf surface. This is a protective mechanism: less surface means less water loss through evaporation and less risk of sunburn on the sensitive leaf tissue. Often, the uppermost leaves most exposed to the sun are affected, while lower leaves in the plant's shade remain normal.

Lack of water. Similar to sun stress, the plant actively reduces its evaporation surface when it doesn't have enough water available – a survival mechanism to retain existing moisture for as long as possible. Here, usually several or even all leaves curl simultaneously, often accompanied by an overall limp, wilted appearance of the entire plant.

Air that is too dry. Especially during the heating season in winter, the humidity in many living spaces drops drastically. Tropical plants, which are naturally accustomed to a humid environment, often react to this with curled leaf edges, frequently combined with dry, brown leaf tips.

Pests. Both spider mites and aphids suck plant sap directly from the leaf tissue. This loss of substance can lead to deformities where the leaf curls or twists – often additionally with visible fine webbing (typical for spider mites) or small, moving insects and sticky honeydew (typical for aphids).

Cold stress or drafts. A sudden drop in temperature, such as from a tilted window in winter or a location directly in front of an air conditioner, can also lead to curled leaves – here often in combination with an overall limp, stressed appearance of the plant.

Nutrient imbalance. Less common, but possible: both a deficiency and an excess of certain nutrients (e.g., potassium) can manifest as deformed, curled leaves, usually accompanied by additional symptoms such as discoloration.

How to narrow down the cause

The first, most important step is observation over the course of the day: If the leaf curls during the day in strong sun and straightens out again in the evening, sun or heat stress is very likely. If, however, the curling persists permanently, regardless of the time of day, a closer look at substrate moisture, humidity, and the undersides of the leaves (for pests) is worthwhile.

A second important clue is whether individual or all leaves are affected. If it primarily affects the sun-exposed upper leaves, this indicates light or heat stress. If all leaves are uniformly affected, including the shadier lower areas, a more systemic problem such as water deficiency or nutrient imbalance is more likely.

How FYTA helps you find the cause

Since so many different factors can lead to the same symptom, mere leaf observation is often not sufficient to reliably distinguish what is actually present. A FYTA Sensor continuously measures substrate moisture, light intensity, and temperature directly at your plant – helping you either confirm or specifically rule out light, water, and temperature stress as the cause. If all measured values show an unremarkable, optimal range, while the leaves still remain curled, this is a strong indication that pests are more likely the cause. In this case, the disease and pest detection in the FYTA App can help: A photo of your plant is enough to get initial indications of whether there is actually an infestation with spider mites, aphids, or other pests – so you can more accurately find the right cause instead of having to try out several possibilities one after another.

Etiolation (also called "geilwuchs") describes the thin, pale, stretched growth of a plant – usually with long distances between the leaves and weak, unstable shoots.

The main cause: lack of light

Etiolation almost always occurs when a plant receives too little light. The plant "stretches" itself in the direction of the strongest available light source, hoping to get closer to more light. Since this growth comes at the expense of stability and leaf density, etiolated plants appear thin, weak, and often unusually pale green.

Contributing factors

• Too much heat in combination with little light. This further accelerates stretched growth, as the plant "thinks" it is a growth-friendly season, although the light is insufficient for it.
• Too dense standing with other plants. Competition for light can also promote etiolation.

What you can do

• Move the plant closer to a light source or supplement with a grow light.
• Already etiolated, thin shoots can be partially trimmed so that the plant grows back more compactly in the new, better location.

How to detect this early

Since etiolation is a direct signal of insufficient light, it's worth checking before the plant visibly suffers. A FYTA Sensor measures the actual light intensity at your location, so you can intervene before stretched growth even develops.

If water droplets appear on the leaf edges or tips, even though the plant has not just been watered or sprayed, it is usually a natural phenomenon called guttation.

What guttation is

Guttation describes the exudation of water (and dissolved minerals therein) directly from the leaf tissue through special openings. This typically happens when the roots absorb more water than the plant can release through normal evaporation (transpiration) – often at night or in the early morning hours when humidity is high and evaporation is correspondingly low.

Is this a problem?

Generally no – guttation is a normal, harmless process and not a sign of illness. It often occurs in well-watered plants in a humid environment, for example, Monstera, strawberries, or grasses.

When you should still pay attention

If the "dripping" occurs very strongly and continuously, this can be an indication of too frequent or too abundant watering – in this case, it is worth looking at the general watering routine, even if guttation itself is harmless.

Mealybugs are one of the most common pests on houseplants and can usually be identified quite clearly if you know what to look for.

Typical identifying features

• White, cottony coating. The most striking feature – small, woolly white patches that look as if someone has placed cotton balls on the plant.
• Preferred hiding places. Mealybugs particularly like to settle in leaf axils, on stems, on the underside of leaves, and in hard-to-reach corners of the plant.
• Sticky honeydew. The insects excrete a sugary, sticky substance that accumulates on leaves and the area around the pot.
• Black sooty mold. A black fungal coating can also form on the sticky honeydew – another indication of an infestation.
• Stunted growth and yellow leaves. Since the mealybugs suck plant sap, the plant weakens overall and shows yellowing or stunted growth.

Where to check best

Mealybugs particularly infest hard-leaved houseplants such as rubber plants, ficus, orchids, or cacti. There is even a subspecies that lives exclusively on the roots and only becomes noticeable when the plant declines despite good care – in this case, it's worth checking the root ball when repotting.

Early detection

Since mealybugs multiply very quickly under favorable conditions, it's worth isolating newly purchased plants for 1-2 weeks and regularly checking the leaf axils and undersides before a small infestation becomes a large one.

Insecticide sticks are a common method for controlling mealybugs: you simply insert them into the plant soil, from where the active ingredient is released by watering and absorbed into the plant's entire sap flow via the roots (systemic effect). When the mealybugs then feed on the plant, they ingest the active ingredient and die.

For whom they work well – and for whom not

Insecticide sticks work reliably for plants that regularly absorb larger amounts of water. For cacti and succulents, however, they often fail: these plants absorb very little water through their roots due to their special metabolism (CAM mechanism), which means that the active ingredient hardly reaches the plant in sufficient quantities. Therefore, sprays or beneficial insects are more suitable for cacti and succulents.

What to consider during application

• Isolate affected plants to prevent spread to other plants.
• Multiple applications necessary. Since the sticks do not kill eggs, new larvae hatch after some time – usually, a repeat application after 10–14 days is necessary to break the cycle.
• Reduced effectiveness in winter. Since many plants absorb less water in winter, less active ingredient is transported – the sticks often work less effectively then.
• Caution with pets and children. Insecticide sticks contain chemical active ingredients and should be used out of reach of animals and children.

Alternatives for mild infestation

For a small, newly discovered infestation, simply wiping off individual mealybugs with a cotton swab soaked in isopropyl alcohol is often enough – completely chemical-free. Insecticide sticks are more worthwhile for larger or recurring infestations.

Early detection of infestation

Mealybugs are particularly common on plants that are already weakened by overly dry air or unsuitable location conditions. With a FYTA Sensor, you can keep an eye on humidity and substrate conditions – a stable climate suitable for the respective plant species makes it more difficult for pests like mealybugs to establish themselves in the first place.

In addition to the well-known mealybugs that live on leaves and stems, there is a special subtype that lives exclusively underground on the roots – the so-called root mealybugs.

How to recognize them

Since they hide in the substrate, an infestation is usually only noticed when the plant wilts, withers, or stops growing properly despite seemingly good care – without anything noticeable on the aerial parts of the plant. If you take the plant out of the pot, you can often recognize the infestation by a white, waxy coating directly on the roots.

What you can do

• Remove the plant from the pot and thoroughly inspect the roots for the white coating.
• Carefully wash the root ball to remove as many of the mealybugs as possible.
• Repot into fresh, clean substrate – the old substrate should be disposed of and not reused.
• For severe infestations, use systemic insecticide sticks or granules that are absorbed through the roots.

Why this is easily overlooked

Since the aerial symptoms (wilting, weak growth) are very non-specific and can easily be confused with other problems such as nutrient deficiency or improper watering, a root mealybug infestation is often only detected late. A FYTA Sensor can help to rule out whether the cause is actually due to moisture, light, or nutrients – if the values remain in the optimal range, but the plant still wilts, it's worth taking a look at the roots.

Spider mites are barely visible to the naked eye (only 0.2–0.8 mm in size), but reveal themselves through fine webs in leaf axils and on the undersides of leaves, as well as light, pinpoint speckles on the leaves.

Immediate measures for light infestation

• Rinse off. Thoroughly rinse the plant with lukewarm water, especially the undersides of the leaves – this directly removes many mites and simultaneously increases humidity, which spider mites dislike.
• Increase humidity. Since spider mites love dry, warm air (typical during heating season), more moisture in the environment already helps preventively.
• Isolate affected plant. Prevents rapid spread to other plants.

Proven home remedies

• Soapy water. One teaspoon of dish soap in one liter of lukewarm water, sprayed on, smothers the mites.
• Rapeseed oil-water mixture. Clumps the breathing holes of the mites.
• Neem oil. Considered one of the most effective remedies, it also inhibits development and reproduction.

For more severe infestations

• Generously remove heavily infested leaves or shoots and dispose of them in household waste (do not compost).
• Use predatory mites (Phytoseiulus persimilis) as natural enemies – particularly effective in conservatories or for larger plant collections.
• Approved pesticides for very severe, persistent infestations.

The decisive prevention factor

Since dry air is by far the greatest risk factor for a spider mite infestation, continuous monitoring of the humidity at your plant's location is worthwhile. A FYTA Sensor measures this directly at your plant's location and helps you detect critical dry periods early, before spider mites can even establish themselves.

Spider mites don't appear "out of nowhere" on your plants, but rather reach them in various ways.

The most common entry routes

• Newly purchased plants. The most common way – spider mites or their eggs are often brought into the house unnoticed with freshly acquired plants.
• Wind and open windows. Outdoors, spider mites can be spread over long distances by the wind and thus also enter indoor spaces through open windows.
• Contact between plants. If plants are close together or their leaves touch, spider mites easily move from one to the next.
• Clothing and tools. They can also be unintentionally carried on gardening tools or clothing.

Why they then multiply so explosively

Spider mites themselves usually only appear in small numbers – the real problem arises when conditions are ideal for them: dry, warm air, especially common during the heating season in winter. Under these conditions, they multiply extremely quickly, so that a few animals quickly turn into a visible infestation.

What this means for you

Since complete prevention is hardly possible, the most important lever is to slow down reproduction – especially by ensuring sufficient humidity. A FYTA Sensor helps you to detect this critical dry period early, before spider mites can properly establish themselves.

Scale insects camouflage themselves well and are often only discovered late – they appear as small, oval to round shields (approx. 1–6 mm) in yellowish-brown to orange, clinging firmly to stems, leaf veins, and undersides of leaves.

How to recognize them

• Small, wart-like, firm bumps on leaves and stems
• Sticky honeydew on leaves and around the plant
• Black sooty mold forming on the honeydew
• Yellowed, stunted, or falling leaves with a more severe infestation

Immediate measures

• 1. Isolate the plant to prevent spread.
• 2. For light infestations: Carefully wipe off scale insects with a cotton swab soaked in alcohol or oil, or remove them with tweezers.
• 3. Wipe off honeydew with a mild soap solution to prevent sooty mold.

For more severe infestations

• Spray preparations based on paraffin or rapeseed oil, treating the undersides of leaves and leaf axils particularly.
• Systemic agents (for watering) that are absorbed through the roots.
• Plan multiple treatments – scale insects are well protected by their armor and usually require several applications at intervals of a few days.

Prevention

Young, strong plants are less susceptible to infestation than weakened or malnourished ones – good general care is therefore the best protection. You should thoroughly inspect new plants before integrating them into your collection, as scale insects are often introduced.

Similar to spider mites, scale insects are usually introduced unnoticed, rather than appearing spontaneously on a plant.

The most common ways

• Newly acquired plants. By far the most common reason – especially the very small, mobile young larvae (so-called "crawlers") are hardly visible to the naked eye and are therefore easily overlooked.
• Contact with already infested plants. If plants are close together, the mobile young larvae easily spread to neighboring plants.
• Ants. Since scale insects produce sugary honeydew, ants can actively "distribute" them to access this food source.

Why they are often discovered late

Adult scale insects are barely mobile and well camouflaged by their shell – an infestation therefore often remains inconspicuous for a long time until initial symptoms such as sticky leaves or growth problems appear.

The most important prevention

Since new plants are the main entry point, it is worthwhile to thoroughly examine freshly purchased plants and isolate them for one to two weeks before integrating them into your collection.

Yellow sticky traps are small, sticky cards in a special yellow tone, used for combating and early detection of flying pests.

The principle of operation

Many flying insect pests such as fungus gnats, whiteflies, winged aphids, or thrips are evolutionarily designed to fly towards yellow hues as potential food or breeding sources – similar to how they would fly towards yellow flowers. The traps use precisely this instinct: as soon as an insect lands, it sticks to the odorless, insecticide-free glue.

What they help against

• Fungus gnats (hatch from the soil)
• Whiteflies
• Winged aphids
• Thrips
• Leaf miners and cicadas

Correct placement

Placement depends on the specific pest:

• Against fungus gnats: as close as possible to the soil surface, as the gnats hatch directly from the substrate.
• Against whiteflies and others: at plant height or directly near the leaves, without hanging the trap into the foliage itself.

What yellow sticky traps cannot do

Important to know: Yellow sticky traps only catch adult, flying insects – eggs and larvae in the substrate remain unaffected. They are therefore ideal for early detection of an infestation and for reducing the adult population, but do not replace additional measures for more severe infestations (e.g., less watering for fungus gnats, as their larvae need moist substrate).

Dead aphids look distinctly different from living ones and often provide a clue as to what killed them.

Typical characteristics of dead aphids

• Dried up and shriveled. Instead of the plump, soft bodies of living aphids, dead specimens appear flat, shriveled, and empty.
• Discoloration. Often a brownish, grayish, or almost translucent color instead of the typical green, black, or yellow of living aphids.
• "Aphid mummies." If the aphids were infested by parasitic wasps, a bloated, brownish-golden, hard shell remains, from which the wasp larva later hatches – a good sign that natural antagonists are already active.
• Sticky residues. After the use of oil or soap preparations, the dead aphids often stick to the underside of the leaf, sometimes surrounded by a slightly shiny film.

Why this is relevant

If you see dead aphids after a treatment, it's a good sign that the measure is working. "Aphid mummies," on the other hand, mean that natural beneficial insects are already dealing with the problem – in this case, it's advisable to be cautious with chemical agents to avoid harming them as well.

The main reason: honeydew

Plants infested with aphids, scale insects, or mealybugs attract ants that "harvest" the sugary honeydew and even protect the pests in the process.

What this means

A sudden appearance of ants is often an indirect indication of an existing pest infestation.

The FYTA App offers disease and pest detection – upload a photo of your plant, and the app will help you assess whether there is actually an infestation that explains the ants.

Small mushrooms or a white, fluffy coating on the soil surface can initially seem alarming – but in most cases, they are harmless to your plant.

Where they come from

Fungal spores are practically ubiquitous in the air and also get into potting soil – often already in the retail packaging. If the substrate contains organic material like bark pieces, compost, or wood fibers, these spores find an ideal food source there and begin to grow as soon as conditions are right.

The most important contributing factors

• Overly moist substrate. By far the most common trigger – fungi love consistently moist, warm environments.
• Poor ventilation. Little air circulation in the room or in the substrate further promotes growth.
• Poor quality potting soil. Soil with a high proportion of not yet fully decomposed organic material (e.g., cheap soil with a lot of wood content) is more susceptible.

Are the fungi dangerous?

For the plant itself, generally not – most of these fungi are so-called saprophytes, which only decompose dead organic material, not the living plant itself. It can at most become problematic if a thick layer forms that blocks water and oxygen exchange. For allergy sufferers or with pets and small children (who might nibble on the soil), however, some caution is advised.

What you can do

• Simply remove visible fungi with a spoon.
• For more severe, recurring infestations, replace the top layer of substrate or repot completely.
• Water more moderately in the future and ensure good drainage (pot with drainage hole, no standing moisture in the cachepot).
• Occasionally ventilate to reduce room humidity.

The actual trigger behind it

Since fungal growth is almost always linked to consistently overly moist substrate, the most reliable prevention is to avoid getting into this situation in the first place. A FYTA Sensor shows you when the substrate has truly dried out, so you don't water "on suspicion" and thus unintentionally create ideal conditions for fungal growth.

Flea beetles are small, jumping beetles (mostly from the genus Phyllotreta) that primarily damage brassicas (cabbage, radishes, arugula, mustard) in the garden.

How to recognize them

Flea beetles are only 1.5–3 mm in size, usually shiny black (some species with yellow stripes), and are mainly noticeable by their characteristic, small, round holes in the leaves – a so-called "shot-hole pattern." When touched or disturbed, the beetles immediately jump away, which gave them their name.

When they are particularly active

Flea beetles appear mainly in spring and during warm, dry weather, and prefer to infest young, tender seedlings and young plants – in the worst case, they can destroy the entire new growth.

What you can do

• Stretch horticultural fleece directly over the bed after sowing – the most effective preventive measure.
• Practice crop rotation. Do not grow brassicas in the same location for several consecutive years, as flea beetles can overwinter in the soil.
• Promote regular watering and moist soil. Flea beetles prefer dry conditions – a sufficiently moist bed makes it more uncomfortable for them.
• Use yellow sticky traps to monitor and reduce the adult beetles.
• Companion planting with strong-smelling plants (e.g., onions, garlic) between susceptible crops can also deter flea beetles.

Important to know

Adult, strong plants with a sufficiently developed root system usually tolerate a light flea beetle infestation much better than freshly germinated young plants – good general care is therefore the best protection.

Aerial roots are roots that grow above the substrate, instead of developing underground like typical roots. They are a completely normal, important characteristic of many tropical climbing and epiphytic plants like Monstera, Philodendron, or orchids.

What is their function?

• Water and nutrient absorption from the air: In their natural environment, aerial roots absorb moisture directly from the humid, tropical air.
• Support and climbing: For climbing plants, aerial roots serve to anchor themselves to trees or other structures and grow upwards.
• Additional stability: If they reach the ground, they can root there and further anchor the plant.

Should you remove aerial roots?

No – removing aerial roots is usually unnecessary and can even harm the plant, as they serve an active function. If they are visually unappealing, you can simply guide them towards the substrate or a climbing aid instead. Some plant enthusiasts even place their aerial roots specifically in a glass of water to provide the plant with additional moisture during longer absences.

What unusual aerial root growth can mean

If a plant suddenly forms a strikingly large number of new aerial roots, this can sometimes be an indication of overly dry ambient air or stress – the plant then tries to absorb additional moisture from the air. With a FYTA Sensor, you can monitor the actual humidity and substrate moisture and assess whether this behavior is due to a location factor.

Water roots are roots that a plant develops specifically for growing in water instead of in a substrate – they differ structurally from normal "soil roots."

The difference from normal roots

Soil roots are designed to burrow through solid substrate and overcome mechanical resistance. Water roots, on the other hand, grow in a medium without resistance and develop to be thinner, more glassy, and often more brittle, but also more efficient for direct water and oxygen absorption in a moist environment.

When they develop

You will most often encounter water roots when you place cuttings in a glass of water for propagation – for example, with Pothos, Monstera, or Philodendron. The plant then forms roots specifically adapted to this environment.

What to consider when transferring to substrate

If you transfer a plant with pure water roots directly into soil, the transition can be stressful: The plant essentially has to form new, adapted soil roots, which can take some time. Some plant enthusiasts therefore consciously allow a transition period with half water, half moist substrate to make the transition gentler.

A shoot is the above-ground, growing part of a plant, consisting of the stem together with the leaves, buds, and possibly flowers attached to it. The term is usually used for new, relatively young growth.

The most important shoot terms

• New shoot: freshly formed, young growth, often recognizable at the shoot tip by its lighter color and softer structure
• Main shoot: the central, usually strongest shoot of a plant
• Side shoot: a shoot that grows laterally from the main shoot or a leaf axil
• Long shoot / short shoot: differentiates shoots according to their growth rate and length

Why shoots are important for care assessment

The condition of the shoot tips often provides a more reliable indication of a plant's health than individual leaves: If the plant continues to grow vigorously at the shoot tips, it is usually fundamentally healthy, even if individual older leaves turn yellow or fall off.

Monstera deliciosa is one of the longest-lived houseplants. Under good conditions, it can easily live for 10 to 15 years, and many well-cared-for specimens live significantly longer – reports of Monsteras that have reached 20, 30, or even over 40 years are not uncommon.

Why the figures vary so widely

The lifespan depends heavily on the care conditions: light, watering habits, substrate quality, and how often it is repotted play a much greater role than the mere "age" of the plant itself. Since Monsteras are also able to simply take a break from growth under unfavorable conditions instead of dying, they can survive difficult phases well and then continue to grow vigorously.

A few milestones along the way

• The first characteristic holes in the leaves (fenestration) usually develop at an age of 1–2 years.
• A Monstera should only be repotted about every 2–3 years – and only if the roots are growing out of the drainage holes or the substrate dries out very quickly.
• A Monstera as a houseplant only forms flowers and fruits under optimal conditions, and then usually only after the age of 10 years.

How to support the age of your Monstera

Since over- or underwatering and sudden changes in location are among the most common reasons why Monsteras are prematurely weakened, continuous monitoring of conditions is worthwhile. A FYTA Sensor helps you keep an eye on moisture, light, and temperature, so that your Monstera not only lives long but also stays healthy and strong over the years.

Under good conditions, Monstera deliciosa is one of the faster-growing houseplants, although the pace depends heavily on location and care.

Rough guidelines

During the growing season (spring to summer), a well-cared-for Monstera can produce several new leaves per month and achieve 30 to over 60 cm of stem growth per year, depending on conditions. In autumn and winter, when light becomes scarcer, growth slows down noticeably or almost completely pauses.

What most influences the growth rate

• Light. Probably the biggest factor – too little light drastically slows down growth, even if all other conditions are right.
• Substrate and nutrients. An airy, nutrient-rich substrate significantly supports rapid growth.
• Humidity and temperature. Warm, humid conditions (similar to its tropical home) further promote growth.
• Climbing aid. A Monstera that can climb (e.g., on a moss pole) often grows more compactly and quickly than one that hangs freely.

A note on leaf shape

Young Monsteras initially do not form holes (fenestration) in their leaves – this only happens at an age of about 1–2 years and is a sign of maturity, not a problem.

How to support growth

Since light is the number one limiting factor, it is worthwhile to carefully check whether the location is actually sufficient. A FYTA Sensor measures the actual light intensity directly at your plant, so you know whether lack of growth is really due to the location or needs to be sought elsewhere.

Aerial roots are a completely normal and important feature of Monstera – in its natural environment, it uses them to cling to trees and absorb additional moisture from the air. As a houseplant, they form in the same way, even without the Monstera being able to climb there.

The most common options for dealing with them

Just leave them. The simplest solution – aerial roots do not harm the plant, even if they don't look "neat."

Guide them towards the substrate. You can carefully bend aerial roots towards the pot rim so that they eventually grow into the substrate and absorb additional support and nutrients there.

Guide them to a climbing aid. A moss pole or trellis gives the aerial roots a structure to cling to – this also supports juicier, more compact growth.

Place them in a glass of water. Some plant enthusiasts put individual aerial roots in a water vessel next to the pot to provide the plant with additional moisture, for example, during longer absences.

Should they be cut off?

Generally not necessary, as they fulfill an active function. If you want to remove individual aerial roots for aesthetic reasons, occasional trimming with clean, sharp scissors usually does not harm an overall healthy plant – but you should refrain from doing so excessively or permanently.

When many new aerial roots can be an indicator

If your Monstera suddenly forms an unusually large number of new aerial roots, this can sometimes indicate overly dry ambient air – the plant tries to absorb additional moisture from the air. With a FYTA Sensor, you can monitor the humidity at its location and assess whether help is needed here.

Short answer: Usually nothing dramatic – the Monstera won't die. But it's not entirely without consequences either.

What actually happens

Aerial roots fulfill a supportive function for the plant: they help it cling to climbing structures and absorb additional moisture and nutrients from the air. If you cut them off, the plant loses this additional support at that exact point – however, the main roots in the substrate continue to supply it, so the plant remains healthy overall.

What you should pay attention to

• Only cut individual roots and use sharp, clean tools. An unclean cut can create entry points for pathogens.
• Do not cut directly at the base of the stem, but leave some distance to avoid unnecessarily injuring the plant.
• Do not remove all aerial roots at once. Occasional trimming for aesthetic reasons is unproblematic, but radically cutting back all aerial roots at once can unnecessarily stress the plant.

When you should better avoid it

If your Monstera is growing on a climbing aid and the aerial roots actively contribute to stability, cutting them off would make it harder for the plant to cling to the structure. In this case, it is more sensible to simply leave them or guide them towards the substrate or climbing aid instead of removing them.

Monstera deliciosa is originally a climbing plant from tropical forests – its natural environment provides important clues for the right substrate.

Key characteristics

• Loose and well-draining so that excess water drains well and the roots do not sit in waterlogged soil.
• Sufficiently water-retentive so that the substrate does not dry out completely too quickly between waterings.
• Nutrient-rich to support the vigorous growth of the Monstera.

A typical mixture

A proven base is normal, high-quality potting soil, enriched with perlite or pumice (for drainage), some orchid bark or coconut fibers (for structure and air in the substrate), and optionally some compost or worm castings for additional nutrients.

Ready-made alternatives

Commercially available "Aroid substrates" (specifically for Araceae plants like Monstera) are already pre-mixed in a suitable ratio and are an uncomplicated alternative to mixing your own.

Calathea is considered attractive but somewhat demanding – however, with the right conditions, it thrives reliably.

Location

A bright spot without direct sun is ideal – too much light fades the characteristic leaf patterns, too little light makes the leaves uniformly green. Calathea does not like drafts or changes of location.

Watering

The soil should be kept consistently slightly moist – Calatheas tolerate dryness poorly, but waterlogging just as little. During the growing season, usually 1–2 times a week, much less frequently in winter. It is best to water with low-calcium water (rainwater or stale tap water), as hard water hinders nutrient absorption.

Humidity

At 50–80%, Calathea needs significantly more humidity than many other houseplants – a humidifier or a spot in the bathroom is often the simplest solution.

Substrate

A loose, humus-rich substrate with good drainage – for example, potting soil enriched with perlite, coconut coir, or orchid bark – and a slightly acidic pH value (approx. 5–6) are best.

Fertilizing

Every 1–2 weeks during the growing season (spring to autumn) with a liquid fertilizer for green plants, completely pause in winter.

Typical warning signs

• Drooping leaves: usually thirst or a location that is too cool.
• Brown leaf edges: too low humidity or hard water.
• Curled leaves during the day: too much direct sun or too dry substrate.

Since both too much and too little moisture quickly lead to problems with Calathea, a FYTA Sensor helps to reliably hit the narrow, "slightly moist" range, instead of estimating it by feel.

Most Calathea species remain relatively compact as houseplants, but there are significant differences depending on the variety.

Typical size range

Most commercially available Calathea varieties reach a height of about 30 to 60 cm, with the leaves often growing wider and creating a rather bushy overall impression.

Larger exceptions

Some species, such as Calathea orbifolia or Calathea lancifolia (Calathea with lance-shaped leaves), can reach 70 cm or more under good conditions.

How to support growth

The final size depends heavily on the location, humidity, and pot size. A Calathea that is regularly repotted into a slightly larger pot (approximately every 1–2 years) and receives optimal conditions (partial shade, high humidity, consistent moisture) tends to grow larger and bushier than a plant that remains permanently in the same, too-small pot.

The right timing and technique are crucial for orchids, as their substrate degrades over time and loses its structure.

When to repot

The ideal time is immediately after flowering, usually in spring. Repotting is necessary if:

• the substrate (mostly bark pieces) has decomposed and become mushy
• the roots are growing vigorously out of the pot
• the orchid has not been repotted for 2–3 years

How to repot

• 1. Carefully remove the plant from the pot, completely remove the old substrate.
• 2. Inspect the roots – healthy roots are firm and greenish to silvery-white; remove brown, spongy roots with clean scissors.
• 3. Place in fresh orchid substrate (coarse bark pieces, often with some sphagnum moss) in a transparent or special orchid pot with good drainage.
• 4. Do not plant too deeply – the base of the plant should be approximately at the level of the substrate surface.
• 5. After repotting, do not water for a few days so that any small root injuries can heal first.

Important note

Orchids should not be repotted annually as a routine, but only when one of the above conditions actually applies – repotting too frequently unnecessarily stresses the plant.

Cacti need a significantly more permeable, mineral substrate than most other houseplants – their biggest enemy is standing moisture around the roots.

What makes a good cactus substrate

• Very good drainage: Water must drain quickly to prevent waterlogging.
• Low organic matter content: Unlike classic potting soil, cactus substrate needs very little humus.
• Coarse, mineral structure: This provides air in the substrate and prevents compaction.

A typical mix

A proven base is a mixture of approximately half normal, peat-reduced potting soil and the other half of mineral aggregates such as sand, perlite, pumice, or fine lava rock. Alternatively, ready-made cactus and succulent soil, already pre-mixed in this ratio, is available in stores.

Also important

A pot with drainage holes is practically mandatory for cacti – without this hole, even the best substrate cannot get rid of excess water. A drainage layer of gravel or expanded clay at the bottom of the pot can also help, although a good substrate alone is usually sufficient.

Since cacti are particularly sensitive to waterlogging, but at the same time cannot survive completely without water, reliable moisture measurement is particularly worthwhile here. A FYTA sensor helps you to find exactly the narrow line between "sufficiently dry" and "bone dry for too long".

Succulents store water in their leaves and stems and are adapted to long dry periods – their biggest enemy is therefore not too little, but too much water.

The basic rule: water thoroughly, then let dry completely

Instead of giving small amounts regularly, it is best to water thoroughly until water runs out of the bottom of the pot, and then let the substrate dry out completely before watering again. This method is often called "Soak and Dry".

How often that actually is

During the growing season in spring and summer, most succulents only need to be watered every 1-2 weeks. In autumn and winter, when many succulents enter a dormant phase, a rhythm of every 3-4 weeks or even less often is often sufficient.

How to tell when to water

Instead of watering strictly by calendar, it is worth looking at the substrate and the leaves: If the soil is completely dry and the leaves appear slightly limp or less plump than usual, it is time for the next watering.

The most common source of error

Since succulents tolerate waterlogging particularly poorly, too frequent watering quickly leads to root rot – often the most common cause of death in this group of plants. A FYTA sensor helps you to track the actual degree of dryness in the substrate, instead of watering according to a rigid schedule that does not suit the actual conditions at your location.

With palm trees, there is a crucial difference to many other plants: They only have one active growth point – the so-called apical meristem, also known as the "palm heart". Unlike trees with many shoots, the survival of the entire palm tree depends on exactly this one point.

The spear test

Gently grasp the youngest, still rolled-up leaf in the center of the crown – the so-called spear – and pull lightly on it.

• If it is firm: The growth point is alive, the palm has a good chance of recovering.
• If it can be easily pulled out and the base is mushy, brown, or slimy: The heart has rotted – a very serious sign, but not automatically the definitive end yet.

Further signs you can also check

• Smell: A musty or rotten smell from the crown area indicates advanced heart rot.
• Color of the growth point: Healthy tissue is light and firm; black, soft tissue is already dead.
• New shoots: Even if many older fronds are brown, this is not a death sentence – older leaves die off normally from bottom to top in palms. Only the condition of the heart is decisive.

What you can do if the heart is damaged but still alive

Keep the crown area as dry as possible (do not water directly into the heart), treat it with a suitable fungicide if a fungal infection is suspected, and water the roots sparingly until the palm has recovered. You can remove dry, completely brown fronds – but under no circumstances cut or trim the growth point itself.

Prevention is easier than rescue

The most common causes of a rotting heart are waterlogging and cold in combination with moisture. A FYTA sensor helps you to identify this critical combination early, before it reaches the sensitive growth point.

The watering needs of palm trees depend heavily on the specific species, but generally: keep evenly moist rather than letting them dry out completely.

Basic rhythm

During the growing season, water usually 1-2 times a week, so that the substrate remains consistently slightly moist. In winter, when growth slows down, reduce significantly – every 2 weeks is often enough here.

The most important rule

Palms tolerate neither prolonged drought nor waterlogging well. A finger test (2-3 cm deep into the substrate) helps to find the right time – if the top layer has dried, but it is still slightly moist underneath, watering is usually not yet necessary.

Species-specific differences

Mediterranean species such as the dwarf palm tolerate a little more drought, while tropical indoor palms such as the Kentia palm require more constant moisture.

For eucalyptus – whether kept as a container plant or houseplant – the same principles generally apply as for most woody plants, but with a few eucalyptus-specific characteristics.

The scratch test

Carefully scratch the bark of a branch with your fingernail or a knife. If green, moist tissue appears underneath, this part is still alive. If the tissue is brown and dry, this branch has died – test in several places, as individual branches can die while the plant as a whole survives.

What else you can check

• Flexibility of the branches: Live branches can be easily bent without breaking immediately. Dead branches are brittle and break dry.
• Roots: White to light brown, firm roots are healthy; black, slimy roots indicate root rot.
• New growth at the base: Even if the upper parts appear completely dead, many eucalyptus species sprout again from the base – so give the plant some time before giving up on it.

Common causes of apparent dying back

Eucalyptus is sensitive to frost (many species are not hardy) and to waterlogging. After a cold winter, many plants initially look completely brown, but sprout surprisingly again in spring – provided the roots and the shoot base have remained intact.

The oleander is generally robust, but reacts sensitively if its special needs are not met – and these differ from most other plants in one important respect.

The most common causes

Lack of water. This is the most common cause for oleander – and at the same time surprising, as many other plants tend to suffer from too much water. The oleander originally grows on riverbanks and tolerates waterlogging well. Too little water typically shows up with a time delay: Only a few days after the dry period do the leaves turn bright yellow.

Nutrient deficiency. Oleander is a heavy feeder, especially in pots. If there is a lack of nitrogen or potassium, the leaves turn yellow, but often do not fall off immediately.

Lack of light. A location that is too shady, for example due to a house wall or other plants, also causes the leaves to yellow.

Overly warm overwintering. If the oleander is kept too warm in winter (e.g. in a heated living room instead of a cool, bright place), it often reacts with yellow leaves.

Natural leaf change. Oleander leaves live for a maximum of about two years. If only individual, older leaves in the interior of the shrub turn yellow, while the shoot tips grow back vigorously green, this is a completely normal process and no cause for concern.

Oleander canker. If dark, crusted growths appear on the shoots in addition to the yellow leaves, it may be this bacterial disease. It is not curable but can be managed well – affected shoots should be generously cut back into healthy wood.

The rule of thumb for a quick check

If only individual, older leaves in the interior turn yellow, while the shoot tips remain vigorously green, everything is fine. Only when young leaves are affected or larger areas turn yellow at once is it worth looking for the exact cause.

What helps

Since both too little water and (less often) nutrient problems are the main causes for oleander, it is worth looking at both factors simultaneously. A FYTA sensor measures moisture and nutrient content (EC value) directly in the substrate, so you can quickly assess which of the possible causes actually applies to your oleander.

The ZZ plant (Zamioculcas zamiifolia) is considered very easy to care for – yet yellow leaves are a common signal that something is wrong.

The most common cause: overwatering

The ZZ plant stores water in its rhizomes and is adapted to dry conditions. Too frequent watering leads to waterlogging, the roots begin to rot, which means the plant is no longer sufficiently supplied – the leaves turn yellow and fall off.

Other possible causes

• Lack of water. Even though the ZZ plant tolerates drought well, extreme, prolonged lack of water also leads to yellowed, wilting leaves.
• Spider mites. Rare, but possible – indicated by small yellow spots that gradually spread over the entire leaf.
• Root damage during repotting. This usually only affects a single shoot, while the rest of the plant remains healthy.
• Natural aging. Individual, older leaves turn yellow normally and can be removed without hesitation.

How to narrow down the cause

First check the substrate: If it is constantly moist or smells musty, overwatering is very likely. If, on the other hand, it has been completely dry for weeks, it is more likely due to too little water. If overwatering is suspected, remove the plant from the pot, remove rotten root parts and repot in fresh, dry substrate.

The dragon tree (Dracaena) is one of the least demanding houseplants and accordingly requires little water.

Basic rhythm

During the growing season, watering once every 1-2 weeks is usually sufficient, in winter often only every 3-4 weeks. The substrate should dry out completely between waterings.

Why less is often more

The dragon tree reacts significantly more sensitively to too much than to too little water – waterlogging quickly leads to root rot, while short dry periods are tolerated without problems.

Signs of incorrect watering

• Brown leaf tips: often a sign of hard (calcareous) watering water, but can also indicate dry air.
• Yellow, soft leaves: usually an indication of overwatering.

Carnivorous plants (e.g. Venus flytrap, sundew, pitcher plant) have very specific needs that differ greatly from normal houseplants.

Substrate

Nutrient-poor, acidic substrate is crucial – typically a mixture of white peat (or peat-free alternatives) and quartz sand or perlite. Normal, nutrient-rich potting soil is unsuitable and can damage the roots.

Water

Only use low-lime water – preferably distilled water or rainwater. Tap water usually contains too much lime and minerals, which can damage the sensitive roots. Many species are best kept permanently in a shallow saucer of water (tray method).

Light

Most carnivorous plants need a lot of direct light – a bright, sunny location is important here, unlike most other houseplants.

Feeding

Additional fertilizing is not necessary and can even be harmful – the plants meet their nutrient needs through trapped insects. Additional feeding with insects is optional and not absolutely necessary if the plant is outdoors or near a window.

Overwintering

Many species (e.g. Venus flytrap) require a cool, bright winter dormancy at lower temperatures – year-round warm room temperature weakens them in the long term.

The poinsettia (Euphorbia pulcherrima) originally comes from Mexico and Central America, where it grows in tropical, deciduous forests – especially in coastal regions with distinct dry and rainy seasons.

Original growth

In its native habitat, the poinsettia does not grow as a compact potted plant, but as a shrub up to several meters tall. It was only through targeted breeding that it was transformed into the compact, bushy form we know from commerce.

Why it's called "Poinsettia"

The actual flower of the poinsettia is inconspicuous and small – the well-known red (or white, pink, yellow) "petals" are botanically speaking bracts that change color under the influence of shorter daylight phases in autumn. This makes it a classic winter and Christmas season plant, even though its natural home is tropical.

What this means for care here

Since the poinsettia originally comes from a warm, tropical climate, it is not winter hardy in this country and must be kept as a houseplant at temperatures above 15 °C, in a bright location without direct cold or drafts.

Hostas are generally robust shade perennials, but their leaves turn distinctly yellow when they have problems.

The most common causes

Too much direct sun. Hostas are shade plants – too much direct sunlight leads to bleached, yellowish leaves and burns on the edges.

Lack of water. With prolonged drought, hostas react with wilting, yellowish leaves, especially on hot days.

Waterlogging. Equally problematic – constantly overly moist soil can lead to root rot, which also manifests as yellowing.

Nutrient deficiency. Especially in older locations with depleted soil, a lack of nitrogen can lead to uniform yellowing.

Natural autumn process. In autumn, hosta leaves turn yellow quite normally before the plant goes dormant for winter – this is no cause for concern.

What you can do

First, check the season – yellowing is normal in autumn. Outside of this time, it is worth looking at the location (too sunny?) and soil moisture to distinguish between lack of water and waterlogging.

The Bird of Paradise flower (Strelitzia) is a vigorous grower with a correspondingly high nutrient requirement, especially if it is to flower regularly.

Recommended Fertilizer Type

A balanced liquid fertilizer for green plants or specifically for flowering container plants is well suited. A sufficient proportion of potassium and phosphorus is important, as these nutrients particularly support flower formation.

Fertilizer Rhythm

During the growth phase (spring to summer), the Strelitzia benefits from regular fertilization approximately every 2 weeks, diluted with the irrigation water. In autumn and winter, when growth slows down, fertilization should be significantly reduced or completely paused.

Why Patience is Important

Strelitzias often only flower after several years, once they are sufficiently large and established – excessive fertilization does not necessarily accelerate this process, but over-dosing can lead to nutrient damage to the roots.

Banana plants (Musa) are among the thirstiest indoor and container plants – their natural habitat is humid, tropical regions.

Basic Water Requirement

During the growth phase (spring to summer), banana plants require frequent, abundant watering – the substrate should be kept consistently slightly moist, without becoming waterlogged. In summer, with high temperatures, almost daily watering may be necessary.

What You Should Pay Attention To

• Good drainage is important despite the high water requirement – banana plants like a lot of water, but not constantly standing water in the pot.
• High humidity also helps, as the large leaves evaporate a lot of water through their surface.
• Significantly reduce in winter, as growth slows down considerably in the colder season.

How to Reliably Estimate the Need

Since the high water requirement of a banana plant can easily turn into overwatering if the drainage is not right, continuous monitoring is worthwhile. A FYTA sensor helps you reliably strike the balance between "consistently moist" and "too wet."

Yellow leaves on roses can have several causes – from harmless to requiring treatment.

The Most Common Causes

Nutrient deficiency. Roses are heavy feeders. If there is a lack of nitrogen, the older, lower leaves will yellow evenly first. A deficiency in magnesium or iron, on the other hand, often shows up as yellowing between the green leaf veins.

Black spot. A very common fungal disease that manifests as black, star-shaped spots on the leaves before they completely yellow and fall off. Affected leaves should be removed and not composted.

Over or underwatering. Both waterlogging and prolonged drought can lead to yellowing – a look at the actual moisture level in the soil helps here.

Natural leaf change.

Individual, older leaves yellow and fall off normally over time – this is no cause for concern as long as the rest of the plant grows healthily.

What You Can Do

First check if there are black spots (black spot) or if the yellowing is even or patterned (more likely a nutrient or water problem). In case of fungal infection, remove affected leaves and ensure better air circulation; in case of nutrient deficiency, fertilize specifically.

Curling leaves on tomatoes are a common but ambiguous symptom with several possible causes.

The Most Common Causes

Heat stress. On very hot days, tomato leaves often curl upwards to reduce transpiration area – a natural protective mechanism that usually subsides in the evening.

Irregular watering. Both overly dry and overly wet substrate, or strong fluctuations between the two states, can lead to leaf curling.

Excessive pruning. Pruning too radically (suckering) can temporarily lead to curled leaves, as the plant reacts to the intervention.

Herbicide exposure. Even small amounts of certain weed killers (e.g., from contaminated compost or neighboring treated areas) can cause pronounced leaf curling.

Virus infections. Certain viral diseases (e.g., Tomato Leaf Curl Virus) lead to permanent leaf curling, often combined with yellowing. Unlike with heat or water stress, this form does not recede.

How to Distinguish

If the curling subsides in the evening or after watering, it is usually heat or water stress. If the curling persists and is accompanied by yellowing or stunted growth, a viral disease is suspected – affected plants should then be removed to prevent spread.

Cucumbers quickly show clear symptoms on their leaves when problems arise – the exact appearance gives a hint to the cause.

Yellow Leaves

Mostly a sign of nutrient deficiency (especially nitrogen, magnesium) or overwatering that damages the roots. Natural aging of older, lower leaves is also normal.

Brown Leaves

Often caused by powdery mildew (true or false mildew) – recognizable by a whitish or yellowish-brown coating – or by sunburn from too intense, direct sunlight.

Drooping Leaves

Mostly a sign of water deficiency, especially on hot days. Cucumbers have a high water requirement and quickly react with wilting leaves if the substrate becomes too dry. However, it can also occur with waterlogging if the roots are already damaged.

What You Can Do

• Water regularly and sufficiently, especially in hot weather, without causing waterlogging.
• Remove mildew-affected leaves and ensure sufficient distance between plants for good air circulation.
• Provide regular feeding with a balanced vegetable fertilizer.

Zucchini, like pumpkins and cucumbers, have a high water requirement but are sensitive to incorrect watering.

Basic Principles

• Water regularly and thoroughly, especially during flowering and fruit set – irregular watering can lead to bitter taste or fruit rot.
• Water directly at the root area, not over the leaves, to prevent powdery mildew and other fungal diseases.
• Water in the morning so the leaves can dry during the day.

How Often

In hot, dry periods, daily or almost daily watering is common; on milder days, every 2–3 days is sufficient. The exact requirement strongly depends on soil type and sun exposure.

A Common Mistake

Too sparse, superficial watering quickly leads to blossom end rot in zucchini, as the plant cannot transport enough calcium to the fruits with irregular water supply.

Pumpkin plants are among the thirstiest vegetable plants in the garden – their large leaves evaporate a lot of water, and their fruits consist largely of water.

Basic Water Requirement

During the growth and fruiting phase, pumpkin plants require regular, thorough watering – in heat and drought often several times a week, and on very hot days even daily.

What You Should Pay Attention To

• Water thoroughly rather than superficially, so that the water penetrates deep into the roots.
• Water directly at the root area, not over the leaves, to prevent fungal diseases like powdery mildew.
• Mulching helps to retain moisture in the soil longer and reduces watering efforts.

Important Note on Fruit Development

Especially during fruit development, consistent water supply is crucial – strong fluctuations between dryness and wetness can lead to cracks in the fruits or stunted growth.

Bell pepper plants in a greenhouse have a slightly different watering requirement than outdoors due to the protected, often warmer environment.

Basic Rhythm

Usually water every 1–2 days, and on very hot days in the greenhouse even daily – the substrate should be evenly moist, but not waterlogged.

Why the Greenhouse Plays a Role

In a greenhouse, temperatures often rise significantly higher than outdoors, which increases the water requirement accordingly. At the same time, humidity in the greenhouse is often higher, which can slightly slow down evaporation from the substrate.

Practical Tip

Water directly at the root area, not over the leaves, to prevent fungal diseases that can spread particularly well in the warm, humid greenhouse climate. Regular ventilation also helps to keep the humidity in a healthy range.

Petunias are among the thirstier balcony and garden plants, especially when grown in pots or hanging baskets.

Basic Water Requirement

In the summer months and during full bloom, petunias often require daily watering, and on particularly hot days even twice daily – especially if they are in smaller containers with limited substrate volume.

Why Petunias are So Thirsty

Petunias produce many flowers and a dense, shallow root system, which means they consume water relatively quickly. Pots and hanging baskets also dry out faster than bed plantings, as the substrate volume is limited and the sun can affect them from multiple sides.

What You Should Pay Attention To

• Never let them dry out completely. Petunias react to drought stress with wilting leaves and rapid flower loss.
• Still avoid waterlogging. A pot with a good drainage hole is important, even if petunias need a lot of water.
• Fertilize regularly, as the high water requirement often goes hand in hand with an equally high nutrient requirement – weekly fertilization during the flowering period is common.

How to Keep Track of the Actual Need

Since the water requirement of petunias varies greatly depending on weather, location, and pot size, continuous monitoring is worthwhile instead of a rigid watering schedule. A FYTA Sensor reliably shows you when your petunias really need water – a real advantage, especially with the fast-drying substrates in pots and hanging baskets.

With geraniums (pelargoniums), yellow leaves are usually a care signal that can be well narrowed down.

The Most Common Causes

Overwatering. Geraniums tolerate waterlogging poorly – too frequent watering leads to root rot and consequently to yellowed, often limp leaves.

Nutrient deficiency. Geraniums are flowering plants with a high nutrient requirement, especially during the flowering period. If there is a lack of nitrogen, the older, lower leaves will yellow first.

Too little light. Geraniums need a very sunny location – in too shady a spot, the leaves will yellow and flowering will decrease.

Natural leaf change. Older leaves in the lower part of the plant normally yellow over time and can be removed without hesitation.

What You Can Do

First check the substrate – if it is constantly moist, it is probably due to too much water. If the location is too shady, a change to a sunnier spot helps. During the growth and flowering period, fertilize regularly with a flowering plant fertilizer.

The water requirement of ornamental grasses varies greatly depending on the species, but is generally lower than that of many other garden plants.

Basic Classification

Many popular ornamental grasses (e.g., feather grass, miscanthus) are adapted to drier locations and cope well with moderate watering – regular but not excessive watering is usually sufficient. Newly planted grasses require significantly more water in the first few weeks after planting to establish well.

Exceptions

Moisture-loving grasses such as miscanthus (Miscanthus) or sedges (Carex) require significantly more and more consistent water supply than drought-adapted species such as blue fescue grass.

Basic Rule for Most Ornamental Grasses

It's better to water less frequently but thoroughly than frequently in small amounts – this promotes a deeper, more drought-resistant root system, which, especially for most ornamental grasses, corresponds to their natural growth behavior.

Balcony plants in pots and boxes generally have a higher watering requirement than comparable plants in a garden bed, as the substrate volume is limited.

Basic Guidelines

In summer, especially during heat, most balcony plants usually need daily watering – in small pots or hanging baskets in direct sun, sometimes even twice a day. In spring and autumn, every 2–3 days is usually sufficient.

Why Balcony Containers Dry Out So Quickly

Pots and boxes have a limited substrate volume and are often exposed to the sun from several sides (including from below through the pot wall), causing them to dry out significantly faster than comparable plants in garden soil.

Practical Tip

The finger test (feeling 2–3 cm deep into the substrate) provides a quick orientation on whether watering is actually necessary – a rigid schedule does not sufficiently account for weather fluctuations or different location conditions (sun vs. partial shade).

During sustained heat, water evaporates from the soil significantly faster, which noticeably increases the garden's watering needs – exactly how often depends on the soil type and plant species.

General Guidelines

During sustained heat, daily watering is usually no longer sufficient for most established garden plants and lawns – thorough watering every 1–2 days is often more sensible than daily, superficial watering.

The Most Important Principle: Thoroughly Rather Than Often

Frequent, but superficial watering promotes shallow roots, which are particularly susceptible to drought stress during heat. It is better to water less frequently but thoroughly, so that the water penetrates deep into the soil and encourages the roots to grow deeper as well.

The Right Time

Water early in the morning or late in the evening when temperatures are lower – this gives the water time to soak in before it evaporates directly in the midday heat.

Differences by Plant Type

• Lawn: needs thorough watering every 2–3 days during heat instead of daily, short irrigation.
• Potted plants: dry out significantly faster due to the limited substrate volume and require daily checking during heat.
• Newly planted or young plants: do not yet have a deep root system and accordingly need more frequent watering than established plants.

How to assess the actual needs

Since the "correct" frequency varies greatly depending on the substrate, sunlight, and plant type, checking the actual moisture status is more reliable than a rigid schedule. A FYTA Sensor directly shows you how moist your substrate really is – a great help, especially during heatwaves, to water neither too early nor too late.

General guidelines, regardless of the specific type:

• Balcony plants (pots, boxes): usually daily in summer, sometimes twice a day during heatwaves
• Trees (garden): young/freshly planted weekly with thorough watering, established only during prolonged drought
• At 30 °C+: generally more often and thoroughly rather than superficially, preferably in the morning or evening

Since the actual needs vary greatly depending on location, pot size, and weather, a FYTA Sensor shows you the actual current moisture level for each individual plant, instead of having to rely on general schedules. The app automatically adjusts the watering recommendation to the season and growth phase.

During the flowering phase, the nutrient requirement shifts from nitrogen (N) to phosphorus (P) and potassium (K) – special flowering fertilizers have a correspondingly adjusted NPK ratio.

Practical procedure

Fertilization usually every 1–2 weeks with the irrigation water, at the manufacturer's recommended diluted dosage. In the last 1–2 weeks before harvest, fertilizer is usually completely omitted ("flushing") so that no nutrient residues accumulate in the final product.

Water requirement during flowering

The water requirement often increases during this phase, but at the same time, waterlogging is particularly harmful here, as weakened roots can impair flower quality.

FYTA automatically adjusts watering and fertilization recommendations depending on the growth phase of your cannabis plant (germination, vegetative, flowering phase) – especially in the flowering phase, where nutrient and water requirements change quickly, a great advantage over rigid schedules.

Growth height

Highly dependent on strain and cultivation method: Indoor plants often remain compact at 0.5–1.5 m, outdoor plants can reach 2–4 m or more under good conditions.

Time to harvest (Outdoor)

From germination to harvest typically 4–6 months. Outdoor plants are guided by natural light conditions and usually flower from late summer, with harvest in autumn.

Through the FYTA App, you can track the growth cycle of your cannabis plant (germination → vegetative → flowering). Based on this, FYTA automatically adjusts the care instructions for watering, fertilizing, and light to the respective phase – specifically developed for utility and grow plants such as cannabis, tomatoes, or peppers.

In short: none – at least not in the way it is often presented online. The myth that cola acts as a fertilizer persists in forums and social media, but on closer inspection, it has little substance.

What's "true" about the myth

Cola actually contains phosphoric acid (a component also found in classic fertilizers) and a lot of sugar, which could theoretically stimulate microorganisms in the soil. So, purely in terms of ingredients, it's not entirely far-fetched why some people suspect a positive effect.

Why it still doesn't work

• The concentration of relevant nutrients is far too low in relation to the high sugar content to replace a balanced fertilizer.
• Regular application of sugar can even harm microorganisms in the soil and "clog" the roots through putrefaction processes.
• The low pH value of cola can undesirably acidify the soil in the long run.

Why some still report success

If a small sip of cola ends up in a large pot with permeable substrate, it is usually diluted so much that no damage occurs – this explains why the plant "survives", but not why it should grow better. A more plausible reason: Anyone who tries an unusual method like watering with cola usually observes their plant more carefully, perhaps waters more consciously, or adjusts the location. This additional attention alone can make a measurable difference – regardless of the cola itself.

What really helps

Instead of relying on home remedy myths, it's worth looking at what your plant actually needs: the right balance of nutrients, water, and light. A FYTA Sensor shows you the actual nutrient content (EC value) in the substrate – so you reliably know whether your plant really needs fertilizer, instead of trying sugary soft drinks.

Plants fulfill far more functions for us humans than one might initially assume – biologically, health-wise, and psychologically.

Oxygen production and air quality

Through photosynthesis, plants produce oxygen and bind CO₂ – a fundamental building block for life on Earth. While houseplants contribute only on a small scale, they can locally increase humidity and filter some pollutants from indoor air.

Nutrition

Almost all human nutrition is directly or indirectly based on plants – either through direct consumption or as a feed base for farm animals.

Medicine

Many important active ingredients in modern medicine originally come from plants or were inspired by plant models.

Mental well-being

Studies repeatedly show that proximity to plants and green spaces can reduce stress, improve concentration, and positively influence general mood – an effect that is also documented for houseplants indoors.

Ecosystems and biodiversity

Plants form the basis of almost every ecosystem and thus also the livelihood for countless animal species, on which human life in turn depends.

There is indeed a group of plants for which dying after flowering is a completely normal, built-in part of their life cycle – they are called monocarpic plants.

Known examples

The agave (e.g., Agave americana). Often called the "century plant" because it grows for many years (not really a hundred, but often 10–30 years) before forming a single, tall inflorescence – and then dies.

Certain bamboo species. Some bamboo species flower synchronously after many decades and then die off extensively.

Some bromeliads. After flowering, the mother plant usually dies, but often forms small offshoots (pups) beforehand, which continue to grow.

Many annual plants such as sunflowers or calendulas also die after flowering and seed formation – but this is the normal, short life cycle for annual species, not a peculiarity of individual specimens.

Why this makes evolutionary sense

In monocarpic plants, the plant invests all its stored energy into a single, often particularly large flower or seed production – an "all-or-nothing" approach that maximizes reproductive chances, even if the mother plant does not survive afterwards.

Yellowed leaves, wilting shoots, no growth – but what's the reason? Too much water, too little light, missing nutrients? Without the right data, this usually remains a guess. This is exactly where the FYTA App comes in.

How to find out what your plant is missing

The FYTA App is free to download and helps you understand your plants better – regardless of whether you already use a FYTA Sensor or are just starting to deal with your plants.

Even without a sensor: In the app, you will find care instructions for thousands of plant species regarding light, water, substrate, and location – a first, free orientation if you are unsure what your plant might be missing.

With a FYTA Sensor: The Beam is plugged directly into your plant's substrate and continuously measures moisture, light, temperature, and nutrient content (EC value). Instead of guessing, you see in the app in real-time which value is currently wrong – and receive concrete recommendations on what to do.

Why guessing is often not enough

Yellow leaves can have a dozen different causes – too much water, too little water, nutrient deficiency, wrong light, or simply natural aging. From the outside, many of these problems look almost identical. The FYTA Sensor makes this difference visible by showing you which value is actually outside the optimal range – before the plant even shows visible damage.

What the app offers you in detail

• Live values for moisture, light, temperature, and nutrient content
• Notifications when a plant truly needs attention – instead of according to a rigid schedule
• Care instructions tailored to the specific plant species
• Watering and fertilization recommendations that automatically adjust to the season and growth phase
• Garden overview to keep track of multiple plants in different locations in an organized way