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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Acidic compost. Attentive blueberry feeding.
Cultivated blueberries grow as multi-stem bushes; bilberries generally remain lower. Both need suitable acidic root conditions and attentive watering. Fertiliser supplements nutrients, but cannot replace appropriate compost or the choice of a suitable species or cultivar.
- Declared NPK
- 3+3.7+5.5
- Dilution
- 5 ml per 1 l of waterEvery 1–2 weeks during the growing season.
- Application
- Roots & foliage
Fits your blueberry care
Labelled for Vaccinium
For blueberries and Vaccinium species. Cultivated blueberry, bilberry, lingonberry and cranberry differ in habit and care.
During active growth
Feed during actual growth. The regular European period is April/May to September; account for weather, plant condition and existing nutrition.
Consider compost and water
Plan acidic compost and low-lime irrigation water together. Initial nutrients and previous feeds count; investigate the cause of root problems first.
Application in one place
Measure. Mix. Apply.
Dilution calculator for blueberries
Enter the water volume actually needed. For one cultivated blueberry bush, height and full bush width can provide a rough guide. For low, spreading Vaccinium plantings, use water volume.
Your water amountRough watering-volume guide
1 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 bush. Measure height from ground level and the full leafy width, not individual leaves or branches. Use actual water volume for bilberry patches or creeping cranberries. Check the pot, moisture and roots; this is not an individual water requirement or foliar spray volume.
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 dilution. The guide 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
Choose the water volume. The size guide may help with one blueberry bush; calculate low or spreading Vaccinium plantings from the water actually needed.
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, normally April/May to September in Europe. Account for actual growth, initial nutrients and previous feeds; do not push dormant plants or damaged roots with extra applications.
Watering · through the roots
Apply the solution evenly to the pre-moistened root zone. Do not let the fine root ball dry out or stand in water. Drainage and a suitable acidic root environment are particularly easy to monitor in containers.
Spraying · wet both leaf surfaces
Wet upper and lower leaf surfaces evenly, in the morning, evening or under overcast skies. Avoid open bell-shaped flowers. Foliar feeding belongs to the same plan as root watering and is not automatically added on top of full nutrition.
Properties & pack size
Net mass: 280 g for 250 ml.
| Pack size | Price |
|---|---|
| 250 ml | €9,85 EUR |
| 500 ml – twin pack (2 × 250 ml) | €18,95 EUR |
Nutrient composition NPK 3+3.7+5.5
Declared nutrient percentages. Product pH: 6.9.
- 3 % total nitrogen (N)
- 3.7 % water-soluble phosphate (P₂O₅)
- 5.5 % water-soluble potassium oxide (K₂O)
- 2.6 % urea nitrogen
- 0.4 % nitrate nitrogen
- 0.005 % boron (B) · water-soluble
- 0.002 % copper (Cu) · water-soluble · EDTA chelate
- 0.03 % iron (Fe) · water-soluble · EDTA chelate
- 0.006 % manganese (Mn) · water-soluble · EDTA chelate
- 0.0005 % molybdenum (Mo) · water-soluble
- 0.002 % zinc (Zn) · water-soluble · 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 blueberry fertiliser is compatible individually with Schädlings-Frei Organic, Trauermückenfrei Organic, KIRON Milben-Ex or Rosen Pilz-Frei BOCCACIO. This confirmation covers fertiliser plus one product at a time. Check the authorised berry crop, reason for treatment and both products’ directions.
Request the compatibility table →Beyond NPK · understand the formulation
Well mixed – available to leaves and roots
Water-soluble nutrients supplement nutrition for blueberry roots, new shoots and leaves. An acidic root environment remains a separate cultivation requirement. Root and foliar applications belong to one feeding plan.
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 adhesion support distribution on leaf surfaces. Wet upper and lower leaf surfaces evenly and avoid open blueberry flowers.
Reduce hard-water effects
The formulation helps reduce unwanted hard-water effects and deposits on leaves. Low-lime water or rainwater remains useful for blueberries; this does not replace checking the growing medium and water.
Feed with plant tolerance in mind
High plant compatibility under appropriate use also matters for sensitive crops. For blueberries, accurate mixing, a pre-moistened root zone and protection from sun and heat remain important.
Understand leaf function and growth
Nitrogen is needed for chlorophyll and proteins, phosphorus for energy transfer and potassium for water regulation. These functions support leaves, new shoots and developing fruit. Iron is involved in chlorophyll formation, but pale leaves do not establish one particular deficiency.
Chelation can reduce unwanted hard-water effects; it does not remove calcium or magnesium. Product pH 6.9 describes the concentrate, not a target for soil or the finished mixture. The buffer system does not permanently turn lime-rich garden soil into blueberry compost.
Use clean, suitable watering or spraying equipment. Measure the water and calculated concentrate quantity carefully.
Blueberries through the year
From new foliage to ripe berries.
Small flower bells, young leaves and berries ripening in succession make a blueberry bush worth observing. Choose your cultivar for space, flowering and harvest time. Appropriate cultivation supports this development with suitable root conditions.
Soil and water work together.
Nutrient feeding complements care of an appropriate acidic root zone. Unsuitable lime-rich soil cannot be corrected simply by feeding more often. Flowering and fruit set also depend on cultivar, light, pollination and weather.
Leaves supply the bush
Green leaves use light to produce the plant’s own sugars. Autumn colour is often part of the natural cycle in cultivated blueberries and bilberries. Evergreen lingonberries and cranberries do not share the same leaf-fall pattern.
Flower bells and pollinators
Pollinators visit the small bell- or urn-shaped flowers. A second cultivated blueberry cultivar flowering at the same time can support fruit set. Protect open flowers from late frost and maintain daytime access for pollinators.
Berries ripen in succession
The berries on a bush often do not ripen all at once. Pick ripe fruit regularly and keep water supply even. Fruit size and flavour are not guaranteed effects of a higher fertiliser dose.
Make room for a berry bush
A container can be filled with suitable acidic compost and cared for individually. This is useful where garden soil is unsuitable. Adequate root space, drainage and regular moisture checks still matter.
From acidic root conditions to leaves and berries
How does your blueberry use nutrients?
Fine blueberry roots access water and dissolved nutrients in an acidic, well-aerated root environment. Green leaves use light to form sugars that also supply growing shoots and fruit. Nitrogen is needed for chlorophyll and proteins, phosphorus for energy transfer and potassium for water regulation. New basal shoots renew the cultivated blueberry bush and contribute to its future fruiting structure. Flowering and fruit set also require suitable cultivar choice, pollination, light and weather.
Fine roots · explore acidic soilThe fine root system takes up water and dissolved nutrients from a suitable root environment.
Even moisture and air within acidic compost belong together. Vaccinium can associate with ericoid mycorrhizal fungi; this does not create a requirement for an arbitrary fungal preparation. Preserve the fine root ball when planting and avoid damaging it through deep cultivation.
Shoots · renew the bushNew basal shoots complement the framework of mature cultivated blueberries.
Growing shoots need nutrients and sugars from leaves. In mature cultivated bushes, gradually thin selected old, less productive stems. Avoid shearing into a hedge shape: it can remove flower buds and fruiting wood. Low-growing Vaccinium species are treated differently.
Leaves · produce sugars and building materialsHealthy green leaves supply the plant with products of photosynthesis.
Nitrogen is part of chlorophyll and proteins. Iron and manganese have further metabolic functions; their availability also depends on root conditions. Assess pale leaves alongside soil reaction, water, moisture and root condition rather than automatically treating iron deficiency.
Berries · develop from flowersAfter successful fruit set, berries develop and often ripen in succession.
Sugars from leaves and appropriate nutrition contribute to fruit development. Potassium supports water regulation but does not guarantee larger or sweeter berries. More fertiliser cannot compensate for failed pollination or frost-damaged flowers.
Understanding plant feeding
How nutrients enter your blueberry
Blueberries access dissolved nutrients through a fine root system in an acidic root environment. The root ball needs appropriate moisture and air together. Living cells and conducting tissue regulate uptake and onward movement. Suitable leaf surfaces can also take up nutrients from a diluted solution. Both routes belong to one feeding plan; neither replaces suitable compost or checks on irrigation water.
Select a point in the picture or choose a stage.
Stage 01 / 04
The solution reaches the fine root ball
The finished dilution spreads through the pre-moistened root zone. Clear drainage prevents the container from standing permanently in water.
Good to knowCheck existing moisture rather than applying fertiliser to a dry root ball.
A closer look
The finished dilution spreads through the pre-moistened root zone. Clear drainage prevents the container from standing permanently in water. Check existing moisture rather than applying fertiliser to a dry root ball.
Stage 02 / 04
Uptake at fine roots
Absorbing root regions access water and dissolved nutrients. The fine Vaccinium roots are represented functionally here, not as a generic root-hair model.
Good to knowEricoid mycorrhiza can be part of the soil relationship; this does not prescribe an arbitrary fungal preparation.
A closer look
Absorbing root regions access water and dissolved nutrients. The fine Vaccinium roots are represented functionally here, not as a generic root-hair model. Ericoid mycorrhiza can be part of the soil relationship; this does not prescribe an arbitrary fungal preparation.
Stage 03 / 04
Root cells regulate uptake
Membranes and transport proteins regulate entry of dissolved nutrients into living cells. Soil reaction and root condition also influence nutrition.
Good to knowMore concentrate does not correct unsuitable soil pH.
A closer look
Membranes and transport proteins regulate entry of dissolved nutrients into living cells. Soil reaction and root condition also influence nutrition. More concentrate does not correct unsuitable soil pH.
Stage 04 / 04
Onwards to leaves and growing shoots
Conducting tissue connects the roots with the bush. Absorbed nutrients are used in leaf and shoot tissues and can contribute to nutrition of the developing plant.
Good to knowFlowering and fruit set also depend on pollination and weather.
A closer look
Conducting tissue connects the roots with the bush. Absorbed nutrients are used in leaf and shoot tissues and can contribute to nutrition of the developing plant. Flowering and fruit set also depend on pollination and weather.
Stage 01 / 04
Wet both leaf surfaces evenly
Distribute the finished dilution over upper and lower leaf surfaces. Avoid open flower bells and follow light and temperature limits.
Good to knowApply in the morning, evening or under overcast skies.
A closer look
Distribute the finished dilution over upper and lower leaf surfaces. Avoid open flower bells and follow light and temperature limits. Apply in the morning, evening or under overcast skies.
Stage 02 / 04
Across the protective surface
The leaf surface protects the tissue. Dissolved nutrients can cross it; leaf age, surface characteristics and surrounding conditions influence uptake.
Good to knowA wetted leaf is not evidence that the full amount has been absorbed.
A closer look
The leaf surface protects the tissue. Dissolved nutrients can cross it; leaf age, surface characteristics and surrounding conditions influence uptake. A wetted leaf is not evidence that the full amount has been absorbed.
Stage 03 / 04
Use nutrients in leaf metabolism
After crossing the surface, living leaf cells can take up nutrients and use them in metabolic processes. Leaf colour alone does not show which single nutrient is lacking.
Good to knowAssess pale leaves together with soil, water and root condition.
A closer look
After crossing the surface, living leaf cells can take up nutrients and use them in metabolic processes. Leaf colour alone does not show which single nutrient is lacking. Assess pale leaves together with soil, water and root condition.
Stage 04 / 04
Use and possible redistribution
Redistribution from a leaf depends on the nutrient and plant condition. It does not establish immediate full nutrition of all roots, shoots and fruit.
Good to knowCount root and foliar feeds together, not as two complete feeding plans.
A closer look
Redistribution from a leaf depends on the nutrient and plant condition. It does not establish immediate full nutrition of all roots, shoots and fruit. Count root and foliar feeds together, not as two complete feeding plans.
Development influences requirements
Distinguish new growth, fruiting and rest
Young plants & establishment
Preserve the fine root ball, plant appropriately and maintain even moisture. Pre-fertilised compost counts towards nutrition. Check growth and need before extra feeds; the concentrate’s standard dilution remains unchanged.
Develop leaves, flowers and berries
Feed at the specified interval during active growth. Flowering and ripening times depend on species and cultivar. Even watering, access for pollinators and protection of open flowers from late frost are also part of care.
Autumn & dormancy
Cultivated blueberries and bilberries often colour and shed their leaves. Lingonberries and cranberries remain evergreen. Do not add fertiliser during dormancy; continue checking moisture and frost protection, especially in pots.
Development of your species and cultivar is decisive. A shared Vaccinium profile does not imply the same height, pruning routine or harvest calendar.
Application & calculator →Your growing conditions matter
How are you growing your blueberry?
Cultivated blueberries can grow as free-standing fruit bushes or in containers. Bilberries, lingonberries and cranberries have different habits and space requirements. Plan acidic root conditions and irrigation water together.
Containers · monitor moisture and reserves
Use suitable acidic compost and clear drainage holes. Check moisture within the root ball and preferably use low-lime water. Limited reserves require attention, not a higher fertiliser concentration.
Garden · check the soil first
Provide acidic, humus-rich, free-draining conditions without letting the root zone dry out. A small amount of acidic compost will not permanently correct lime-rich garden soil. Where soil and water are unsuitable, a sufficiently large container can be easier to manage.
Winter & late frost · protect roots and flowers
Protect container roots during severe frost and keep drainage clear. Late frost can damage open flowers; manage protection during the day so pollinators regain access. Winter suitability depends on species and cultivar.
Repotting · preserve fine roots
Work on a frost-free day without excessive heat. Keep the root ball together, avoid planting more deeply and fill with suitable compost. The linked blueberry compost is pre-fertilised; plan further feeding after 6–8 weeks and only as appropriate to growth and season.
Acidic compost for the root zone
Suitable compost helps meet your blueberry’s particular soil requirements. Nutrients already present count towards its supply.
-
Blueberry & Lingonberry Compost
€8,95 View productThis blueberry compost contains peat and an initial nutrient charge. Further feeding is intended after 6–8 weeks, then according to season, growth and need.
-
Blueberry Repotting Set
€17,95 View productThe blueberry repotting set combines 10 litres of compost with 250 ml of fertiliser. Count the compost’s initial nutrients rather than immediately adding both nutrient supplies.
Understand plant care problems
Understand blueberry care problems
Wilting despite moist compost, spots, chewing damage or few berries require different checks. Soil reaction, flower frost and pollination matter for blueberries alongside possible pests.
Aphids and feeding damage
Inspect young shoots and leaf undersides. For chewed foliage, also look for beetles or larvae; establish the cause first.
Leaf spots and rust
Photograph spots on both leaf surfaces and any pustules. Colour alone does not distinguish natural autumn change from disease.
Root problems
If a plant wilts despite moist compost, check drainage, the root ball and root condition. More fertiliser cannot correct persistently waterlogged roots.
Pale leaves or few berries
Consider soil pH, irrigation water, light, nutrients, flower frost and pollination together. Yellow foliage does not prove one particular deficiency.
Advice for your blueberry
These details help assess the relationship between root conditions, leaves and fruit development:
- Photos of the whole plant, both leaf surfaces, affected stems and, where relevant, flowers or berries.
- Species or cultivar, age, garden or container, growing medium, soil pH if measured, water source and moisture in the root ball.
- When the change began, frost during flowering, access for pollinators, recent pruning or repotting and previous care products.
Identify species, cause and authorised use before treatment. For edible fruit, also observe waiting periods and harvest directions. Confirmed mixability is not blanket crop authorisation for blueberries or other Vaccinium species.
Confirmed mixing partners
These four plant-care products are each compatible with our liquid blueberry fertiliser.
-
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 blueberries and Vaccinium species. Cultivated blueberry, bilberry, lingonberry and cranberry differ in habit and care.
How do I dilute the concentrate?
Dilution: 5 ml per 1 l 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?
Calculated yield at standard dilution: 250 ml makes 50 litres, and 2 × 250 ml makes 100 litres of nutrient solution.
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.
- Do not use undiluted. Shake well before use.
- Keep out of reach of children and animals.
- Preferably use low-lime water or rainwater at 15–25 °C.
- Do not apply in direct sunlight or at temperatures below 5 °C or above 30 °C.
- Apply to a pre-moistened root zone or spray the foliage. Do not spray open flowers.
- Apply only during the growing season.
- 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. Overdosing can damage plants and pollute the environment.
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 general original leaflet explains safe handling of the concentrate. The blueberry dilution and feeding interval remain product-specific. Acidic compost and suitable water are separate aspects of care.
Guides for this product
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