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 hydrangeas. Understand their leaves and flowers.
Hydrangeas are diverse flowering woody plants. Broad leaves, woody shoots and differently shaped flowerheads define their development. Find straightforward application guidance and deeper knowledge for shrubby garden and container hydrangeas.
- Declared NPK
- 4.8 + 6.0 + 6.7With declared trace nutrients.
- Dilution
- 5 ml per 2.5 l of waterEvery 1–2 weeks during the growing season.
- Application
- Roots & foliageDilute with water before use.
- Storage
- Above 8 °C to a maximum of 38 °CStore in a dry, dark place.
Fits your hydrangea care
For Hydrangea
For hydrangeas: mophead, lacecap, panicle and other Hydrangea species. Match position and pruning to species and cultivar.
During active growth
During active growth when additional nutrients are needed. Account for soil reserves, fresh compost and previous feeds.
Consider water and compost
Account for existing fertiliser after repotting. With our hydrangea compost, start additional feeding only after 6–8 weeks and as needed.
Application in one place
Measure. Mix. Apply.
Dose calculator for hydrangeas
Enter your water volume or use the height and width of one hydrangea shrub as a rough watering guide. For climbing hydrangeas and continuous plantings, use the actual water volume needed.
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.
Only a rough guide to root watering for one hydrangea shrub. Measure height from soil level and the full leafy width. For climbing hydrangeas and continuous borders, use the actual water volume. Check moisture, medium, roots and weather; do not force the suggested amount.
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
Enter the water volume or use the size guide for one shrub. Check root-ball moisture and drainage before watering.
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 the growing season when additional nutrients are needed. Water between feeds as required. Account for soil reserves, fresh compost and previous applications; pause during dormancy.
Watering · through the roots
Moisten the root ball first, then distribute the mixture evenly through the root zone. Ensure free drainage in pots and check soil moisture in borders. Do not feed dry or waterlogged roots.
Spraying · onto the leaves
Finely wet the broad leaf surfaces in the morning, evening or overcast conditions, avoiding open flowerheads. Foliar feeding belongs to the same feeding plan as root applications, not an additional flowering programme.
Properties & pack sizes Pack details for 250 ml and 1 litre
Net mass: 296 g for 250 ml; 1184 g for 1 litre.
The dilution is the same for both pack sizes.
| Pack size | Price |
|---|---|
| 250 ml | €9,85 EUR |
| 500 ml – twin pack (2 × 250 ml) | €18,95 EUR |
| 1 litre | €29,95 EUR |
Nutrient composition NPK 4.8 + 6.0 + 6.7
Declared nutrient percentages. Product pH: 6.4.
- 4.8% total nitrogen (N)
- 1.2% nitrate nitrogen
- 1.4% ammonium nitrogen
- 2.2% urea nitrogen
- 6% water-soluble phosphate (P₂O₅)
- 6.7% water-soluble potassium oxide (K₂O)
- 0.0075% boron (B)
- 0.003% copper (Cu) · water-soluble · EDTA chelate
- 0.015% iron (Fe) · EDTA chelate
- 0.009% manganese (Mn) · EDTA chelate
- 0.0008% molybdenum (Mo)
- 0.003% 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 Hydrangea Fertiliser can be mixed individually with Schädlings-Frei Organic, Trauermückenfrei Organic, KIRON Milben-Ex or Rosen Pilz-Frei BOCCACIO. This confirmation applies to the fertiliser plus one of these products at a time. Follow both products’ specific instructions and any stricter restrictions.
Request the compatibility table →Beyond NPK · understand the formulation
Well mixed – available to leaves and roots
Water-soluble nutrients and coordinated formulation properties make feeding your hydrangea straightforward. Explore what the diluted mixture provides for leaves and roots.
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 used correctly supports the development of leaves and flowering shoots. Balanced nutrition supports your hydrangea’s natural foliage quality.
Understand foliage quality and flower development
Nitrogen supports chlorophyll and protein formation, phosphorus energy transfer, and potassium water balance and substance transport. These functions work together. Leaf finish means even, well-kept foliage, not a glossy coating; flower number and colour also depend on species, pruning and position.
Chelation can reduce unwanted effects of hard water; it does not remove calcium and magnesium. The product pH of 6.4 describes the concentrate, not the soil. The pH of the diluted mixture also depends on the water used; no fixed target or soil-acidifying effect is promised.
Use clean, suitable watering or spraying equipment. Measure the water and calculated concentrate quantity carefully.
Create a flowering space
Broad leaves. Diverse flowerheads. A living garden space.
From fresh shoots to summer flowerheads, hydrangeas change the garden through the seasons. Mophead, lacecap and panicle forms create different effects; match position and care to your species and cultivar.
Support your hydrangea through its growing season.
The concentrate supplements mineral nutrition. Even moisture, a suitable position and correct pruning remain equally important. More fertiliser does not determine flower colour.
Broad foliage frames the flowers
Broad, mostly opposite leaves capture light and make sugars for growth. Leaf size and autumn colour vary between hydrangea species and cultivars.
Flowerheads with individual character
Large display florets shape many hydrangeas. Small fertile flowers are more visible in lacecap forms. A full flowerhead does not automatically mean many seeds or abundant food for insects.
New shoots, new possibilities
New shoots unfold leaves and extend the shrub. Many mopheads carry flower buds on the previous year’s wood; panicle and smooth hydrangeas flower on new wood. Identify the species before pruning.
A flowering place in the garden
As a specimen in a border or a suitable pot, hydrangeas combine striking flowerheads with broad foliage. Light shade and even moisture suit many garden shrubs; species and location remain decisive.
From root zone to flowerhead
How does a hydrangea use nutrients?
Your hydrangea’s fine roots take up water and mineral nutrients. Broad leaves use light to make sugars for growth. Woody shoots connect the plant and carry leaves and flowerheads. Nutrients perform different roles in metabolism. Flower development and bud retention also depend on species, pruning and position.
Roots · absorb and anchorFine roots explore evenly moist, aerated soil.
Active roots need water and oxygen. Humus-rich, free-draining compost and open drainage holes support the root zone in pots. More fertiliser cannot compensate for waterlogging or a dried-out root ball.
Shoots · support & connectWoody shoots form the framework for leaves and flowerheads.
Vascular tissue connects roots and above-ground parts. Potassium contributes to water balance and substance transport. Preserve healthy shoots and prune by species: do not indiscriminately remove flower buds on old wood.
Leaves · capture energyBroad leaf surfaces use light to make sugars.
Nitrogen contributes to chlorophyll and proteins; iron and manganese have roles in metabolism. Yellow leaves can still have several causes. Assess leaf age, moisture, soil reaction and roots together.
Flowers · development & diversityFlowerheads develop from buds whose formation depends on species and cultivar.
Phosphorus contributes to energy transfer but does not determine a specific flower count on its own. Showy display florets are often sterile. Pruning, bud retention, frost and water affect flowering alongside nutrition.
Understanding plant feeding
How nutrients enter your hydrangea
Hydrangeas develop broad leaves and different flowerhead forms according to species. Their roots need even moisture without waterlogging. Root uptake supplies growing shoots; foliar application is another permitted use of this fertiliser. Both routes belong to a shared feeding plan. Flowering wood, pruning and flower colour remain species- and cultivar-dependent.
Select a point in the picture or choose a stage.
Stage 01 / 04
The solution reaches the hydrangea root ball
Apply the diluted mixture to the previously moistened root zone. Wet the root ball evenly without leaving water standing in an outer pot.
Good to knowAssess wilting through root-ball moisture and root health before increasing fertiliser.
A closer look
The first step is contact between dissolved nutrients and root regions capable of uptake. The diagram shows this function, not a species-specific tissue section. Assess wilting through root-ball moisture and root health before increasing fertiliser.
Stage 02 / 04
Uptake at the fine roots
Fine roots and root hairs contact the soil or growing medium. Dissolved nutrients enter root cells through regulated processes.
Good to knowFresh compost and existing soil reserves already contribute to your hydrangea's nutrition.
A closer look
Root hairs increase the contact area. Transport across cell membranes is distinct from water movement alone. Fresh compost and existing soil reserves already contribute to your hydrangea's nutrition.
Stage 03 / 04
Root cells regulate uptake
Cell membranes and transport proteins regulate the entry of dissolved nutrients. These processes are distinct from water moving through the plant.
Good to knowA stronger concentration cannot replace healthy roots or adequate rooting space.
A closer look
Controlled processes within living root cells lie between the surface and the conducting tissue. Functional blocks do not depict the entire root anatomy. A stronger concentration cannot replace healthy roots or adequate rooting space.
Stage 04 / 04
Onwards to shoots and hydrangea leaves
After uptake, water and nutrients can travel through the xylem into shoots and leaves. Growth and flower development still depend on species, cultivar and growing conditions.
Good to knowMophead and panicle hydrangeas do not follow the same pattern of flowering wood.
A closer look
Xylem transports water and dissolved substances. Root health and growing conditions also influence uptake and onward movement. Mophead and panicle hydrangeas do not follow the same pattern of flowering wood.
Stage 01 / 04
The solution wets the hydrangea leaves
Apply the fully diluted mixture as a fine spray to leaf surfaces. Avoid the showy flowerheads; they are not the target of foliar feeding.
Good to knowCount foliar applications within the shared feeding plan, not automatically on top of a full root application.
A closer look
The leaf surface must contact the diluted solution. Wetting is the first step, not evidence that nutrients have already been absorbed. Count foliar applications within the shared feeding plan, not automatically on top of a full root application.
Stage 02 / 04
Across the hydrangea leaf surface
The broad leaf blade has a protective surface. Dissolved nutrients can cross it; leaf age and application conditions affect how much is absorbed.
Good to knowA larger flowerhead is not a reason to increase spray concentration.
A closer look
Nutrients can cross the protective cuticle; routes through stomata may also contribute. Their contribution depends on species and conditions. A larger flowerhead is not a reason to increase spray concentration.
Stage 03 / 04
Use by living leaf cells
Nutrients that have entered the leaf can be absorbed by its cells and used in metabolism. A visible droplet alone is not evidence of uptake.
Good to knowYellowing leaves have several possible causes. Also check soil reaction, watering and roots.
A closer look
After crossing the surface, nutrients can be taken up by living leaf cells. Quantity also depends on the nutrient and surrounding conditions. Yellowing leaves have several possible causes. Also check soil reaction, watering and roots.
Stage 04 / 04
Use and possible redistribution
Movement out of the leaf depends on the nutrient and the hydrangea's condition. Foliar feeding does not promise a particular flower colour.
Good to knowBlue colour is cultivar-dependent and is influenced by soil reaction and available aluminium.
A closer look
Whether and how far nutrients move from a leaf to other parts varies among nutrients. Immediate supply to the whole plant cannot be inferred. Blue colour is cultivar-dependent and is influenced by soil reaction and available aluminium.
Development influences requirements
Distinguish establishment, growth and dormancy
Establishment & young hydrangeas
After planting, first ensure even root-ball moisture and free drainage. Fresh compost may already contain fertiliser. Base the start of feeding on root condition and existing nutrition, not plant height alone.
Leaf, shoot and flower development
Feed at the stated interval during active growth when additional nutrients are needed. Do not use a stronger concentration to compensate for missing flowers: pruning or frost may have removed flower buds on mophead hydrangeas.
Dormancy & bud protection
Pause feeding during dormancy. Autumn leaf fall is normal in deciduous hydrangeas. Species and cultivar determine winter protection; new shoots and existing flower buds can be vulnerable to late frost.
Consider species, growth stage, root condition and existing nutrients together. Height or flower count alone does not justify changing the dilution.
Application & calculator →Your growing conditions matter
How does your hydrangea grow at its site?
For shrubby garden hydrangeas, light, moisture and space matter. Many thrive in light shade; hot midday sun and drying wind increase care demands. Match position and pruning to the species and cultivar.
Pots · moisture and rooting space
Use a sufficiently large pot with free drainage. Check root-ball moisture regularly during warm weather and flowering. Keep compost evenly moist without waterlogging; do not leave water standing in an outer pot.
Borders · account for soil reserves
Humus-rich, free-draining soil and even moisture provide the foundation. Established garden hydrangeas with adequate nutrients do not automatically need extra fertiliser. A soil test can help when the nutrient supply is unclear.
Winter · roots and flower buds
Distinguish winter hardiness and bud sensitivity by species and cultivar. Protect container roots from severe freezing without blocking drainage. Watch new shoots during late frosts. Do not feed during dormancy.
Repotting & pruning · match the species
Provide appropriate root space when a pot becomes densely rooted; retain the previous root-ball level. Account for fertiliser in fresh compost. Identify the species before pruning: mophead and lacecap hydrangeas need a different approach from panicle and smooth hydrangeas.
For your hydrangea’s root zone
Hydrangea compost is available for the next repotting. Its existing fertiliser forms part of the total nutrient supply and affects when liquid feeding begins.
-
Hydrangea Compost
€8,95 View product10 litres of hydrangea compost for repotting. With this pre-fertilised compost, begin additional feeding only after 6–8 weeks and as needed.
Understand plant care problems
What is changing on your hydrangea?
Wilting, yellow leaves or missing flowers do not always mean a nutrient shortage. Check root-ball moisture, drainage, hot sun, frost and the last pruning. Inspect new shoots and leaf undersides too.
Aphids and mites
Inspect new shoots and leaf undersides before choosing treatment.
Mildew and leaf spots
Identify coatings or recurring spots; provide airflow and targeted watering.
Wilting or missing flowers
Check moisture and roots; late frost or incorrect pruning can also prevent flowering.
Advice for your hydrangea
These details help assess growing conditions, root problems or a possible infestation:
- Photos of the whole shrub, both sides of affected leaves, stems and any flower buds.
- Species or cultivar, garden or container, light conditions, growing medium and planting or repotting date.
- When changes began, root-ball moisture, frost history, last pruning and previous fertiliser or plant-care products.
Leaf colour alone does not prove iron deficiency. Root condition and soil reaction also affect nutrient supply. Identify coatings, webbing or recurring spots before choosing a suitable treatment.
Confirmed mixing partners
These four plant-care products can each be mixed individually with our Hydrangea Liquid 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 hydrangeas: mophead, lacecap, panicle and other Hydrangea species. Match position and pruning to species and cultivar.
How do I dilute the concentrate?
Dilution: 5 ml per 2.5 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?
- 250 ml: 125 litres of diluted solution
- 500 ml – twin pack (2 × 250 ml): 250 litres of diluted solution
- 1 litre: 500 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.
- 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.
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 use. Follow this Hydrangea Fertiliser’s product-specific dilution in the calculator. Assess roots and existing nutrition before feeding young, newly planted or damaged plants.
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