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 cucumbers and courgettes. Understand their development.
Cucumbers (Cucumis sativus) and courgettes (Cucurbita pepo) belong to the cucurbit family. Cucumbers climb or trail; courgettes are usually bushy. This page covers this fertiliser’s application and plant knowledge without assigning every cucurbit the same care plan.
- NPK declaration
- 4.3 + 5.7 + 8.5With declared trace nutrients.
- Dilution
- 5 ml per 1.5 l of waterEvery 1–2 weeks during active growth.
- Application
- Root & foliarLabelled for cucumbers and courgettes.
- Young plants
- Initially half strength2.5 ml per 1.5 l of water; account for initial compost nutrients.
Fits your vegetable care
For cucumbers and courgettes
For cucumbers and courgettes in beds, containers or greenhouses. Plan growth habit, space and pollination for the cultivar.
During active growth
During active growth, taking account of development, weather and existing nutrition. No fixed application months are specified.
Account for existing nutrients
After planting or repotting, account for pre-fertilisation in the compost. If roots are dry or damaged, address growing conditions first.
Application in one place
Measure. Mix. Apply.
Cucumber & courgette dilution calculator
Enter the water volume actually needed. Optionally, the height and overall width of one leafy cucumber or courgette plant provide a rough root-watering guide. For flat-trained cucumbers, use the known water volume instead.
Your water amountRough watering-volume guide
1.5 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 root-watering guide for one leafy plant, not for spraying. Measure height from soil level and overall canopy width, not an individual leaf or vine length. For flat-trained cucumbers, use the actual water volume; also assess container, moisture, soil and weather.
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 and choose half strength initially for young plants. Check actual moisture in the root zone.
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. Feed young plants at half strength initially. Count nutrients already supplied and water between feeds as needed. No fixed application months are specified.
Watering · through the roots
Distribute the mixture over the pre-moistened root zone. For trellised cucumbers, feed the actual planting area rather than the entire area beneath long shoots. Containers must allow excess water to drain.
Spraying · onto the leaves
Moisten both leaf surfaces finely in the morning, evening or under overcast skies; avoid open flowers. Foliar feeding belongs to the same feeding plan as root application, not automatically on top of it.
Product characteristics Liquid concentrate for cucumbers and courgettes.
Dilute with water for root or foliar feeding according to the label. The full declaration is given in the nutrient composition section.
- Net mass: 296 g per 250 ml bottle.
| Pack size | Price |
|---|---|
| 250 ml | €9,95 EUR |
| 500 ml – twin pack (2 × 250 ml) | €18,95 EUR |
Nutrient composition NPK 4.3 + 5.7 + 8.5
Product pH: 6.9. This describes the concentrate, not the soil or diluted watering solution.
- 4.3% total nitrogen (N), including 3.6% urea nitrogen.
- 5.7% water-soluble phosphate (P₂O₅).
- 8.5% water-soluble potassium oxide (K₂O).
- Boron (B): 0.0075%.
- 0.003% water-soluble copper (Cu), as EDTA chelate.
- Iron (Fe): 0.0150%, as EDTA chelate.
- Manganese (Mn): 0.0090%, as EDTA chelate.
- Molybdenum (Mo): 0.0008%.
- 0.003% water-soluble zinc (Zn), 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.
Our Cucumber & Courgette Fertiliser is mixable individually with Schädlings-Frei Organic, Trauermückenfrei Organic, KIRON Milben-Ex or Rosen Pilz-Frei BOCCACIO. This covers fertiliser plus one product, not approval for every vegetable application. Observe crop, use location and pre-harvest intervals in both instructions.
Request the compatibility table →Beyond NPK · understand the formulation
The nutrient solution for roots and leaves
Dilute the water-soluble nutrients with water. For cucumbers and courgettes, application to the root zone and to existing foliage is supported.
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 tolerance with appropriate application supports feeding these vegetable crops. Young plants receive the specified half dose initially; warmth, water and roots remain equally important.
Understand leaves, flowers and fruit
Nutrients support leaf formation and metabolism. Leaf finish describes a well-kept appearance, not a glossy coating. This does not guarantee a particular fruit number or an absence of bitterness; crop, cultivar, pollination and growing conditions also matter.
Chelation can reduce disruptive hard-water effects; calcium and magnesium are not removed from the water. The product pH of 6.9 describes the concentrate, not the soil. Source water influences the final mixture’s pH; no fixed target is promised.
Use clean, suitable watering or spraying equipment. Measure the water and calculated concentrate quantity carefully.
Observe cucumbers and courgettes
Broad leaves. Yellow flowers. Young fruit.
Cucumbers climb their supports while bush courgettes spread a leaf canopy closer to the ground. Flowers and young fruit can be seen between the leaves. Growth habit and pollination depend on the crop and cultivar.
Follow the development of your vegetable plants.
Healthy leaves, active roots and appropriate water and nutrients work together. Light, warmth and cultivar-appropriate pollination remain important for fruit development. Fertiliser does not replace these growing conditions.
Leaves produce sugars
Broad leaf surfaces use light for photosynthesis. Preserve healthy foliage; pale markings on some courgette cultivars are not automatically a deficiency or disease.
Distinguish flowers by crop
Courgettes form male and female flowers and usually need pollination. Some cucumber cultivars set fruit without pollination. Follow cultivar guidance and avoid open flowers when spraying.
Look regularly for young fruit
Cucumbers and courgettes are harvested regularly according to cultivar. Leaves can hide small fruits. If fruit set is poor, assess warmth, moisture, crop and pollination rather than increasing the concentration.
Between cucumber supports and courgette beds
Provide a suitable support for climbing cucumbers and enough room for the leaf canopy of bush courgettes. Access to flowers and fruit makes observation, tending and harvesting easier.
From roots to young fruit
How cucumbers and courgettes use nutrients
Fine roots access water and dissolved nutrients in the soil. Broad leaves use light to produce sugars needed for growth and fruit development. Cucumber shoots trail or climb, while bush courgettes carry leaves and fruit around a short main stem. Nitrogen supports protein and chlorophyll formation, phosphorus energy transfer and potassium water regulation. Flower and fruit development also depend on cultivar, warmth and, where required, pollination.
Roots · uptake & anchorageFine root regions absorb water and dissolved nutrients.
Cucumbers and courgettes need consistent moisture without persistent waterlogging. Air in the root zone is important for root function. Disturb the young root ball as little as possible when planting and provide container drainage.
Leaves · turning light into sugarsBroad leaves use light to produce sugars for the plant.
Leaves supply growing shoots and fruit with sugars they produce. Preserve healthy foliage rather than stripping plants regularly. Leaf size, hairs and pale markings differ by crop and cultivar.
Shoots · growth habit and connectionsCucumbers climb or trail; bush courgettes form a short main stem.
Conducting tissue connects roots, leaves and fruit. Guide cucumbers loosely onto suitable supports; bush courgettes need room for their leaf canopy. Do not transfer a shared tomato side-shoot removal routine.
Fruit · follow developmentYoung fruit uses water, sugars and nutrients for development.
Courgettes usually need pollination; some cucumber cultivars set fruit without it. Feeding does not become a pollination treatment. Do not eat bitter-tasting fruit; an extra feed does not make it edible.
Understanding plant feeding
How nutrients enter cucumbers and courgettes
Cucumbers develop long climbing or trailing shoots; courgettes usually form a broad leaf canopy around a short main stem. Green leaves use light to produce sugars for growth and young fruit. Dissolved nutrients enter through absorbing root regions. This fertiliser can also be sprayed onto existing foliage, while avoiding open flowers. Root and foliar applications belong to the same feeding plan. The stages explain uptake and transport as a functional diagram.
Select a point in the picture or choose a stage.
Stage 01 / 04
Nutrient solution reaches the roots
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
Root cells regulate individual uptake steps. 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
Onwards to shoots 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
Distribute the diluted mixture finely over both leaf surfaces. Apply in the morning, evening or under overcast skies and avoid open flowers.
Good to knowThis cucumber and courgette fertiliser is also suitable for foliar application. Use only diluted and count the application within the shared feeding 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 absorb 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
Nutrients may be used in the leaf or redistributed depending on the nutrient. This does not imply immediate, uniform nutrition of all fruit.
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
Young plants, active growth and crop end
Young plants · half strength initially
Feed young plants at the specified half strength initially. Account for initial nutrients, root contact and moisture. No universal age or fixed height defines this initial phase.
Leaf growth, flowers and fruit set
During active growth, further leaves, shoots and fruit develop. Coordinate feeding at the specified interval with water needs and existing nutrition. For poor fruit set, check crop, cultivar and pollination.
Crop end · not a winter care plan
Cucumbers and courgettes are frost-tender vegetable crops normally resown each year. Stop feeding when active growth ends. Autumn dieback is not overwintering dormancy with promised regrowth.
Consider growth, roots, warmth and existing nutrients together. Plant height alone determines neither feeding strength nor water needs.
Application & calculator →Your growing conditions matter
Where do your cucumbers and courgettes grow?
Choose the growing system for the cultivar. Depending on type, cucumbers need greenhouse or outdoor conditions; courgettes generally need enough space in a sunny bed or large container. Warmth, moisture and root space remain the shared foundation.
Container · moisture & drainage
Use adequately sized containers with drainage holes. Check moisture regularly in the restricted root ball and account for initial nutrients. Cucumber supports must be stable; courgette foliage needs lateral space.
Bed · warmth and root space
Plant into sufficiently warm soil after the last frosts. Acclimatise plants to outdoor conditions first. Plan spacing and soil moisture for the crop and account for existing soil nutrients.
Greenhouse · cultivar and climate
Choose an appropriate cucumber cultivar and follow its pollination guidance. Check temperature, moisture and leaf undersides regularly. Extra concentrate cannot compensate for heat or missing pollination in crops that require it.
Raised bed · room for the leaf canopy
Allow courgettes enough room to spread their leaves; cucumbers can be trained onto suitable supports. Account for the raised bed’s structure, moisture and existing nutrients. Do not enter the whole bed area as a single plant in the calculator.
Options for growing vegetables
The linked tomato compost is also intended for vegetable plants in containers and open ground. It remains a pre-fertilised growing medium, not a low-nutrient seed compost. Account for its nutrients when planning later feeds.
-
Tomato Compost
€6,90 View productFor vegetables in containers or open ground. Account for initial nutrients, drainage and root space.
Understand plant care problems
What is changing on your cucumbers or courgettes?
Yellow leaves, coatings and dying young fruits can have different causes. Identify the crop and cultivar and check moisture, warmth and roots. Nutrition and pollination are separate questions.
Aphids, whitefly and mites
Inspect young shoots and leaf undersides. Describe and photograph sticky deposits, pale speckling or webbing when seeking advice.
Mildew and leaf spots
Have white coatings distinguished from other leaf spots. Natural pale markings on courgette leaves are not by themselves evidence of disease.
Poor fruit set
Consider cold, heat, pollination, cultivar and moisture together. Parthenocarpic cucumbers set fruit without pollination; courgettes usually require it.
Bitter fruit
Do not eat bitter-tasting cucumbers, courgettes or pumpkins. Cooking does not reliably make possible cucurbitacins harmless; fertiliser is not a remedy.
Advice for cucumbers and courgettes
These details help assess changes in leaves and developing fruit:
- Photographs of the whole plant, both leaf surfaces, flowers and affected fruit. Include unusual roots or wet compost where relevant.
- Cucumber or courgette, cultivar, seed-grown or grafted young plant, bed or container, greenhouse or outdoors, and growing medium.
- When the change began, temperature, moisture history and previous feeding. For poor fruit set, describe flowers and the cultivar’s pollination requirements.
Natural pale markings on courgette leaves alone do not establish disease. Do not eat bitter-tasting fruit; heating does not reliably make possible cucurbitacins harmless. Extra fertiliser remedies neither bitterness nor missing pollination.
Confirmed mixing partners
Each of these four care products can be mixed individually with our cucumber and courgette 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 cucumbers and courgettes in beds, containers or greenhouses. Plan growth habit, space and pollination for the cultivar.
How do I dilute the concentrate?
Dilution: 5 ml per 1.5 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: 75 litres of diluted solution
- 500 ml – twin pack (2 × 250 ml): 150 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.
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 mixing and application. Use this cucumber and courgette fertiliser’s own dilution in the calculator and plan root and foliar feeds together.
Guides for this product
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