Water-soluble & available
All nutrients are water-soluble. In the fully diluted mixture, they are available for feeding through roots and leaves.
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Feed foliage plants. Understand growth habits.
Houseplants are a growing group drawn from different botanical families. Rubber plants, pothos and spider plants differ in structure and care. The shared product application is therefore complemented by guidance on light, roots and different growth habits.
- NPK designation
- 4.2 + 3.0 + 4.5Full declaration and label note below.
- Dilution
- 5 ml per 2.5 l of waterEvery 1–2 weeks during active growth.
- Application
- Root & foliarLabelled for foliage plants and houseplants.
- Feeding period
- During active growthAllow for light, room temperature and initial nutrients.
Fits your foliage-plant care
Intended for foliage plants
For foliage plants and houseplants during growth. This growing group comprises different species, not one uniform plant form.
Respond to active growth
During active growth. Consider light at the location, growth and existing nutrients together; do not assume a shared fixed winter season.
Consider the root zone
After repotting, account for pre-added fertiliser. With dry or damaged roots, first correct the growing conditions.
Application in one place
Measure. Mix. Apply.
Dilution calculator for foliage plants & houseplants
Enter the water volume actually needed. Height and width of a single upright foliage plant can provide a rough watering guide. For long vines, trailing forms and special growing systems, use the actual water volume.
Your water amountRough watering-volume guide
2.5 l
Matching concentrate amount
5 ml
1 capful = 5 ml. Use a suitable measuring aid for smaller partial amounts.
Enter a water amount from 0.1 to 1,000 litres.
A rough guide only for root watering of a single upright, leafy plant, not foliar spraying. Measure height from the medium and total plant width, not the length of a vine or individual leaf. For trailing forms, specialist crops and unsuitable geometry, use actual water volume; this is not a hydroponic formula.
How the guide is calculated
General GREEN24 guide: height (m) × width (m) × 3–4 litres. Centimetres are converted to metres. The concentrate amount follows this fertiliser’s standard dilution. The estimate does not measure individual water requirements.
Prepare a clean container
Use a clean watering can or sprayer; preferably low-lime water or rainwater at 15–25 °C.
Calculate the amount
Enter the water volume. When using the size-based guide, also check root space and actual root-ball moisture.
Add some water first
Start by filling the container with part of the chosen water volume.
Shake & measure
Shake the bottle. 1 capful = 5 ml; use a measuring aid for smaller partial amounts.
Add the concentrate
Add the calculated amount of concentrate to the water.
Top up & mix well
Top up to the chosen water volume and mix well. Watering or spraying: see below.
When to feed? Every 1–2 weeks during active growth. Consider growth, light at the site and existing nutrients together. Water between feeds according to actual need; do not continue a fixed summer feeding routine when growth has stopped because of low light.
Watering · through the roots
Pre-moisten the root zone and distribute the mixture evenly through the root ball. Excess water must drain; remove water from saucers or outer pots. The required water volume also depends on the species, medium and root-ball moisture.
Spraying · onto the leaves
Finely wet suitable leaf surfaces in the morning, evening or under overcast skies; avoid open flowers. Consider leaf structure and plant species. Foliar feeding belongs to the same nutrient plan as root feeding, not an automatic addition.
Product characteristics Liquid concentrate for foliage plants and houseplants.
Dilute with water for root or foliar feeding according to the label. Individual houseplants differ in their needs; the full declaration is collected in the following section.
- Net mass: 277 g per 250 ml bottle.
| Pack size | Price |
|---|---|
| 250 ml | €9,85 EUR |
| 500 ml – twin pack (2 × 250 ml) | €18,95 EUR |
Nutrient composition NPK designation 4.2 + 3.0 + 4.5
Product pH: 6.9. This describes the concentrate, not the soil or diluted watering solution.
The German nutrient declaration states 4.25% total nitrogen; the English label states 4.2%. The figures below follow the German declaration.
- 4.25% total nitrogen (N), including 4.00% urea nitrogen.
- 3.00% water-soluble phosphate (P₂O₅).
- 4.50% water-soluble potassium oxide (K₂O).
- Boron (B): 0.0050%.
- Copper (Cu): 0.0020%, as EDTA chelate.
- Iron (Fe): 0.0100%, as EDTA chelate.
- Manganese (Mn): 0.0060%, as EDTA chelate.
- Molybdenum (Mo): 0.0005%.
- Zinc (Zn): 0.0020%, as EDTA chelate.
Compost, other fertilisers & care products
Pre-fertilised soil and fertiliser already in the root ball contribute to the nutrient supply. Each of the four care products listed below can be mixed with our liquid fertiliser. When applying them together, follow both products’ specific instructions; conflicting or stricter directions take precedence. Do not mix undiluted concentrates.
This liquid fertiliser is individually compatible with Schädlings-Frei Organic, Trauermückenfrei Organic, KIRON Milben-Ex or Rosen Pilz-Frei BOCCACIO. This confirms fertiliser plus one product at a time, not authorisation for every houseplant or use in living spaces. Follow both sets of instructions.
Request the compatibility table →Beyond NPK · understand the formulation
Well mixed – available to leaves and roots
Water-soluble nutrients and formulation properties support the nutrition of growing foliage plants. The diluted mixture reaches the root zone or suitable leaf surfaces. Different growth habits retain their own light and water requirements.
Protected trace nutrients
Copper, iron, manganese and zinc are declared as EDTA chelates. This binding helps keep these trace nutrients available in solution.
pH buffering for the mixture
The buffer system helps regulate the pH of the finished watering or spraying solution. The source water also influences the resulting value.
Even coverage on the leaf
Good wetting and adherence help distribute the spray solution across the leaves. Dissolved nutrients are then available at the leaf surface for uptake.
Reduce hard-water effects
The formulation helps reduce adverse hard-water effects and deposits on the leaves. Low-lime water or rainwater provides a good starting point.
Feed with plant tolerance in mind
High plant compatibility when applied correctly supports feeding, including sensitive crops. Suitable medium, light and moisture remain separate requirements for houseplants.
Understand leaf formation and development
Nutrients contribute to the formation of new leaves and to metabolism. Leaf finish describes a well-kept appearance, not an applied glossy film. Fertiliser neither creates species-specific leaf shapes nor replaces light for leaf metabolism.
Chelation can reduce interfering effects of water hardness; it does not remove calcium and magnesium from water. The product pH of 6.9 describes the concentrate, not the medium. Source water influences the pH of the prepared mixture; no fixed target value is promised.
Use clean, suitable watering or spraying equipment. Measure the water and calculated concentrate quantity carefully.
Foliage plants in living spaces
Leaves. New growth. Roots.
A rubber plant develops woody stems, pothos climbs or trails, and a spider plant forms a rosette. Observe your plant’s growth habit and new leaves. These examples represent different houseplants, not a single botanical species.
Feed foliage plants for their growing conditions.
Nutrition complements light, a suitable growing medium and watering according to need. More concentrate cannot replace a brighter position. Climbing, rosette-forming and woody plants are managed according to their own development.
Leaves use the light
Green leaf surfaces use light to produce sugars for growth and maintenance. Shape, firmness and markings differ between rubber plants, pothos and other foliage plants. Individual older leaves can be replaced without all houseplants sharing one leaf-fall season.
Understand new growth
New leaves emerge on stems, vines or in the centre of a rosette. Growth habit also determines suitable pruning: a woody plant is managed differently from a rosette. Do not routinely shorten all shoot tips or rosette centres.
Roots need suitable space
Fine roots contact water and dissolved nutrients in the medium. Pot size, aeration and moisture patterns work together. Water-storing plants such as snake plants require a different watering routine from foliage plants needing more consistent moisture.
Plan light and growth habit together
Assess the light at the plant itself, not only how bright the room appears. Large leaves need space, climbers suitable support, and trailing plants room for their shoots. Moving a plant changes its conditions even without repotting.
From roots to a new leaf
How foliage plants use nutrients
Fine roots take up water and dissolved nutrients from the potting medium. Green leaf surfaces use light to produce sugars for growth and maintenance. Woody stems, vines and rosettes arrange their leaves differently within the available light. Nitrogen contributes to proteins and chlorophyll, phosphorus to energy transfer and potassium to water regulation. Whether and how quickly new leaves emerge therefore also depends on species, root condition and actual light at the growing site.
Roots · uptake & anchorageFine root areas access water and dissolved nutrients.
Absorbing fine roots need contact with moist, aerated medium. A confined root ball cannot be judged from leaf size alone. The moisture requirements of pothos are not identical to those of a water-storing snake plant.
Stems · growth habit and connectionCarry or arrange leaves and connect them with the roots through conducting tissues.
Rubber plants develop branching woody stems; pothos produces climbing or trailing vines. A spider plant instead grows from a rosette. These differences determine pruning; a rosette centre must not be treated like a woody side shoot.
Leaves · turning light into sugarsGreen leaf surfaces produce sugars for growth and maintenance.
Nutrients support metabolism but cannot replace light. Leaf size, markings and firmness are species-specific and can change as the plant develops. Many foliage plants retain leaves long term, while individual old leaves are still replaced.
Nutrients · metabolism and transportAre taken up, used within the plant and redistributed according to the nutrient.
Root uptake supplies the plant through its conducting tissues; foliar feeding complements the same nutrient plan. Absorbed nutrients contribute to the structure and metabolism of new leaves. Mobility differs between nutrients; an application does not automatically reach every shoot tip immediately.
Understanding plant feeding
How nutrients enter your foliage plant
Watering brings the diluted mixture to your foliage plant’s root ball. Fine roots contact the solution within the medium. Foliar application is also possible on suitable leaf surfaces. Rubber plants, pothos and rosette-forming plants differ in structure and moisture needs but share basic uptake functions. The stations explain those functions, not a microscopic section through every houseplant.
Select a point in the picture or choose a stage.
Stage 01 / 04
Nutrient solution reaches the root ball
In pre-moistened soil, the diluted mixture meets fine root areas. Dissolved nutrients are available for uptake at the contact surface.
Good to knowAlways dilute the concentrate and keep to the stated dosage.
A closer look
Watering carries dissolved nutrients into the growing medium around the roots. Contact with the absorbing root surfaces is the first step.
Stage 02 / 04
Uptake at the root surface
Fine root hairs increase contact with the soil. Transport proteins in cell membranes help take up dissolved nutrients.
Good to knowRoots take up nutrients; they do not simply absorb all the fertiliser along with the water.
A closer look
Root hairs increase the contact area. Transport proteins in cell membranes enable mineral ions to enter; water movement and nutrient uptake are distinct processes.
Stage 03 / 04
Living root cells regulate uptake
Controlled steps in living root cells determine uptake. The plant is not simply flushed through with the entire contents of the watering solution.
Good to knowMore fertiliser does not automatically mean better nutrition.
A closer look
Controlled steps within root tissue lie between the root surface and onward transport. Transport across cell membranes enables nutrient uptake; water movement and nutrient uptake are different processes.
Stage 04 / 04
Onward to stems and leaves
Water and absorbed nutrients can move through the xylem to above-ground parts. Healthy roots and active leaves are part of this process.
Good to knowHealthy roots and suitable growing conditions are important for nutrient supply.
A closer look
After entering the vascular tissue, nutrients can travel with the water stream in the xylem towards the shoot. Uptake and nutrient supply also depend on root health and growing conditions.
Stage 01 / 04
The solution wets the leaf surface
The diluted mixture meets a suitable leaf surface. Surface structure and species influence wetting; apply in the morning, evening or under overcast skies.
Good to knowThis foliage plant fertiliser is also suitable for foliar application. Apply only diluted to suitable leaf surfaces and include it in the shared nutrient plan.
A closer look
Foliar feeding places diluted nutrient solution on the leaf surface. Wetting depends on factors including the leaf surface and the solution.
Stage 02 / 04
Crossing the protective leaf surface
Dissolved nutrients can cross the protective surface layer; routes involving small leaf openings may also contribute. Conditions and leaf characteristics affect uptake.
Good to knowDifferent leaves do not absorb a nutrient solution equally well.
A closer look
Dissolved nutrients can pass through the protective cuticle; pathways involving stomata may also contribute. Their relative importance varies with plant species and conditions.
Stage 03 / 04
Leaf cells take up nutrients
After crossing the surface, living leaf cells can take up nutrients and use them in metabolism. A visible droplet alone does not demonstrate this step.
Good to knowA droplet on a leaf does not yet mean its nutrients have been absorbed.
A closer look
After crossing the surface, nutrients can be taken up by living leaf cells. The amount depends on factors including the nutrient, formulation and environmental conditions.
Stage 04 / 04
Use in the leaf and onward movement
Absorbed nutrients may be used in the leaf or redistributed according to the nutrient. This does not mean every leaf and shoot tip receives an immediate, uniform supply.
Good to knowFoliar feeding does not mean every nutrient immediately reaches the whole plant.
A closer look
Absorbed nutrients can be used within the leaf. Whether and how far they move to other plant parts depends on the nutrient and the plant's condition.
Development influences requirements
Establishment, growth and low-light periods
Young or recently repotted plants
First establish suitable medium, root contact and moisture in the new pot. Pre-fertilised medium already contributes nutrients. Plant height alone does not justify an additional concentration level for this concentrate.
New leaves and stems
During active growth, leaves develop on stems, vines or in the rosette centre depending on growth habit. Light and root space need to suit development. The specified feeding supplements these conditions; long, weak shoots do not justify a stronger solution.
Low-light periods · assess growth
Houseplants do not share one winter dormancy period. Growth may slow markedly with less light; adjust water and further feeding accordingly. Warm, adequately lit plants may continue growing differently from those in a low-light winter position.
Consider species, light, roots and existing nutrients together. Size neither changes standard dilution nor determines water need by itself.
Application & calculator →Your growing conditions matter
Where does your foliage plant grow?
Container, location and growth habit work together. A bright window position differs from a room’s interior; trailing plants and large woody plants arrange their leaves differently. Specialist crops need their own media and care routines.
Pot · moisture and drainage
Use a suitable container with unobstructed drainage. Check root-ball moisture and pot weight rather than only looking at the surface. Plan repotting according to root space, medium condition and stability, preferably during active growth.
Window position · actual light
Many tropical foliage plants prefer bright, filtered light; other species tolerate more sun or less light. Direct sunshine, cold glass and abrupt moves impose different stresses. The species determines suitability, not one universal houseplant value.
Living space · warmth and air
Consider nearby heating, cold draughts and low light deeper inside a room. Humidity and temperature requirements differ by species. Houseplants replace neither regular ventilation nor technical air filters.
Special growth habits & media
Climbers may need support, while rosettes retain their own growing centre. Snake plants need a different moisture pattern from many soft-leaved species; assess orchids and ferns separately. The plant-size guide is not a hydroponic recommendation.
For repotting and container care
Foliage Plant Compost is an option for suitable container-grown foliage plants. Choose an appropriate specialist medium for orchids or strongly water-storing species. The planting trowel helps fill and distribute the medium; it does not change its suitability.
-
Foliage & Houseplant Compost
€8,95 View productFoliage Plant Compost for suitable container crops. Account for pre-added fertiliser; do not use it as a general garden soil amendment.
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Sneeboer Planting Trowel with Cherry Wood Handle
€54,95 View productPlanting trowel for filling and distributing medium when repotting. Take account of the root ball and previous planting depth.
Understand plant care problems
What is changing on your houseplant?
Yellow leaves, brown margins or weak new growth have different causes. Identify the plant first and check light, root-ball moisture and roots. Distance from the window and conditions around the plant matter alongside previous feeding.
Mites, thrips and sap-feeding pests
Inspect leaf undersides and shoot bases with a hand lens. Photograph fine webs, pale feeding marks, sticky deposits or cotton-like patches and identify the cause.
Fungus gnats
Small dark flies above the compost may be fungus gnats. Check moisture management, roots and actual infestation; do not dry plants with different water needs indiscriminately.
Spots, rot and wilting
For soft stems or wilting despite wet compost, check standing water and roots. Persistently wet leaves and poor air movement can worsen problems.
Yellow leaves and brown edges
Consider light, water, room conditions and roots together. Individual ageing leaves differ from rapid leaf loss; add nutrients only when needed.
Advice for your foliage plants and houseplants
This information helps us assess leaf development, growth habit and possible damage more precisely:
- Photographs of the whole plant, new growth and both leaf surfaces; include unusual roots or soft stems.
- Plant name, growth habit, pot size, drainage and growing medium. For trailing plants, state shoot length separately.
- Window direction and distance from the window, nearby heating, watering history, recent moves and previous feeding.
Leaf colour alone does not prove a nutrient deficiency. Inspect leaf undersides when you see webbing, silvery marks, sticky deposits or scale-like bumps. Fungus gnats and soft roots call for checking moisture and medium, not an automatic increase in concentration.
Confirmed mixing partners
These four care products are individually compatible with our foliage plant and houseplant liquid fertiliser.
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Dr. Stähler
Schädlings-Frei-Organic – 100 ml
€16,95
Insect control: check the pest, plant species and authorised application site.
Mixable with GREEN24 liquid fertilisersView product & application -
Dr. Stähler
Trauermückenfrei Organic – 30 ml, neem concentrate against fungus gnat larvae
€9,99
For fungus gnat larvae: follow the authorised crop and watering application.
Mixable with GREEN24 liquid fertilisersView product & application -
Dr. Stähler
KIRON Milben-Ex – 30 ml
€12,95
Mite control: identify the infestation and follow the authorised application.
Mixable with GREEN24 liquid fertilisersView product & application -
Dr. Stähler
BOCCACIO Rosen Pilz-Frei – 24 ml
€13,95
Fungal control: check the disease, plant species and authorised growing situation.
Mixable with GREEN24 liquid fertilisersView product & application
Mixability applies to fertiliser plus one product at a time, not to all products mixed together. Follow crop, pest, application site, dose, waiting periods and the stricter requirements of both sets of instructions. Do not mix undiluted concentrates.
Use plant protection products safely. Always read the label and product information before use.
Quick answers before you buy (FAQ)
Is this fertiliser suitable for my plant?
For foliage plants and houseplants during growth. This growing group comprises different species, not one uniform plant form.
How do I dilute the concentrate?
Dilution: 5 ml per 2.5 litres of water.
Measure out the concentrate and mix it with the stated amount of water. Never apply undiluted.
How much solution does one pack make?
- 250 ml: 125 litres of diluted solution
- 500 ml – twin pack (2 × 250 ml): 250 litres of diluted solution
Calculated at the stated standard dilution; the amount needed per application depends on the plant and growing conditions.
What should I check before use?
Do not apply in sunlight, below 5 °C or above 30 °C. Never apply the concentrate undiluted.
Safety and storage
Safety instructions
SDS – Safety data sheet available on request.
- Shake before use. Never apply undiluted.
- Preferably use low-lime water or rainwater at 15–25°C.
- Do not feed in direct sunlight, below 5°C or above 30°C.
- Feed only the pre-moistened root zone or spray foliage; avoid open flowers.
- Keep out of reach of children and animals.
- Apply only during active growth. For foliar feeding, wet the upper and lower leaf surfaces evenly.
- Overdosing can damage plants and pollute the environment.
Avoid contact with eyes, skin and clothing. Do not inhale spray mist. Wear protective clothing, rubber gloves and safety glasses when handling the product. Keep away from food and beverages. Wash your face and hands thoroughly after use. Official advisory recommendations take precedence. Fertilisers may leave permanent stains on surfaces. Do not allow fertiliser to enter bodies of water or wastewater.
Official advisory recommendations take precedence.
Wash your face and hands thoroughly. Use diluted fertiliser promptly and keep it out of water bodies and wastewater.
Storage
Storage & product quality
Store in a dry, dark place above +8 °C and no higher than +38 °C. Keep out of reach of children and animals.
Keep tightly closed in the original container, separate from food and animal feed.
Avoid large temperature fluctuations. Temperature-related discolouration or crystals may occur; the crystals dissolve by the dilution stage at the latest and do not impair product quality. For this fertiliser, store dry and dark above 8 °C and at no more than 38 °C. Use diluted fertiliser promptly.
Do not allow fertiliser residues or rinsing water to enter waterways or wastewater. Follow the disposal instructions on the packaging.
Measure concentrate accurately and apply only after dilution. More fertiliser does not compensate for insufficient light, drought or damaged roots.
Manufacturer / company placing the product on the market
Product GPSR safety information
The original leaflet explains safe preparation and application. Use this concentrate’s own dilution in the calculator and account for root and foliar applications together.
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