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 your Japanese maple. Understand its growth.
Acer palmatum is a deciduous ornamental woody plant with palmately lobed leaves. Upright, broad and weeping cultivars need different amounts of space. Find application guidance and deeper knowledge for garden and container plants.
- Declared NPK
- 3.9 + 3.2 + 4.8With declared trace nutrients.
- Dilution
- 5 ml per 2 l of waterEvery 2–4 weeks during the growing season.
- Application
- Roots & foliageDilute with water before use.
- Regular application period
- April–SeptemberApply only during active growth.
For your Japanese maple
For Japanese maple species
For Japanese maples. The linked plant knowledge concerns Acer palmatum, including finely divided laceleaf cultivars, not every Acer species.
Follow active growth
During active growth, regularly April–September. Account for soil reserves, fresh compost and previous feeds.
Consider roots and compost
Account for existing fertiliser after repotting. With Tree & Shrub Compost, review nutrient supply after about 4–6 weeks and feed only if needed.
Application in one place
Measure. Mix. Apply.
Dose calculator for Japanese maple
Enter the actual water volume needed or use the height and full crown width of one Japanese maple as a rough watering guide. For bonsai trays and specially trained forms, use the actual water volume.
Your water amountRough watering-volume guide
2 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 Japanese maple. Measure height from soil level and the full width of the leafy crown. For bonsai trays or specially trained forms, 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 maple. For bonsai trays, enter the actual water volume. 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 2–4 weeks during the growing season, regularly April–September. Account for soil reserves, fresh compost and previous feeds. Water between feeds as needed; 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. Address a dry root ball or waterlogging first; do not use a stronger feed as a supposed correction.
Spraying · onto the leaves
Finely wet the lobed leaf surfaces in the morning, evening or overcast conditions, avoiding open flowers. Foliar application belongs to the same feeding plan as root feeding. Fine or red leaves do not imply a different spray concentration.
Properties & pack sizes Pack details for 250 ml and 1 litre
Net mass: 278 g for 250 ml; 1111 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 3.9 + 3.2 + 4.8
Declared nutrient percentages. Product pH: 6.8.
- 3.9% total nitrogen (N)
- 3.6% urea nitrogen
- 3.2% water-soluble phosphate (P₂O₅)
- 4.8% water-soluble potassium oxide (K₂O)
- 0.005% boron (B)
- 0.002% copper (Cu) · EDTA chelate
- 0.01% iron (Fe) · EDTA chelate
- 0.006% manganese (Mn) · EDTA chelate
- 0.0005% molybdenum (Mo)
- 0.002% zinc (Zn) · 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 Maple 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 support mineral nutrition for your Japanese maple. The mixture can be applied to the root zone or leaf surfaces.
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 is also relevant to sensitive plants. With fine maple foliage, the correct dilution and protection from sun, heat and drying winds remain important.
Understand leaf function and growth
Nitrogen contributes to chlorophyll and proteins, phosphorus to energy transfer, and potassium to water balance and substance transport. These functions work together. Leaf finish means well-kept foliage, not a glossy coating or promised autumn colour. Cultivar colour and natural habit remain plant characteristics.
Chelation can reduce unwanted effects of hard water; it does not remove calcium and magnesium. The product pH of 6.8 describes the concentrate, not the soil. The pH of the diluted mixture also depends on the source water; no fixed target is promised.
Use clean, suitable watering or spraying equipment. Measure the water and calculated concentrate quantity carefully.
Observe your Japanese maple through the seasons
Lobed leaves. Fine branching. Changing seasons.
Acer palmatum can be upright, broad or weeping according to cultivar. Spring growth, summer foliage and autumn colour differ. A sheltered position allows these features to develop; they are not a promised fertiliser effect.
Understand how your maple grows.
The concentrate supplements mineral nutrition during growth. Even moisture, shelter from drying winds and appropriate root space remain important. Cultivar and position strongly influence leaf colour and growth habit.
Palmately lobed foliage
Japanese maple leaves are palmately lobed. Laceleaf forms have particularly finely divided segments. Leaf size and colour vary between cultivars and seasons.
Autumn colour is part of the seasonal cycle
Leaf colour changes before autumn leaf fall. Its intensity and timing depend on cultivar and weather. It does not establish a need for fertiliser or a particular colour effect from the concentrate.
New growth and natural branching
New shoots unfold the next generation of leaves. Upright and weeping cultivars develop different crowns. Preserve the natural branch framework; a Japanese maple does not need regular clipping like a hedge.
Japanese maple in a container
Compact cultivars can be grown in suitable containers. Allow space for the crown and check rooting space as needed. A container position needs shelter from drying winds and free drainage.
From the root zone into the crown
How does Japanese maple use nutrients?
Japanese maple’s fine roots take up water and dissolved nutrients. Conducting tissues in the wood connect the root zone to the crown. The lobed leaves use light to make sugars for growth. Nutrients are needed for the development and metabolism of leaves and shoots. Cultivar, season and position affect leaf colour and growth independently of any single fertiliser application.
Roots · absorb and anchorFine roots explore evenly moist, aerated soil.
Active roots need moisture and oxygen. Humus-rich, free-draining soil and open drainage holes maintain suitable conditions. Crisp leaf edges can indicate water-balance problems and are not a reason to increase fertiliser concentration.
Woody framework · support & conductTrunk and branches support the crown and connect it to the roots.
Vascular tissue in the wood transports water and dissolved substances. Potassium contributes to water balance and substance transport. Preserve natural branching where possible; avoid major pruning and indiscriminately shortening every shoot tip.
Leaves · capture energyPalmately lobed leaves use light to make sugars.
Nitrogen contributes to chlorophyll and proteins; iron and manganese have roles in metabolism. Red or yellow cultivar foliage is not automatically a deficiency sign. Compare changes with cultivar traits, leaf age, sun and moisture.
Young shoots · extend the crownNew shoots unfold leaves and continue the cultivar’s characteristic branching.
New growth and branch length depend on cultivar, position and development. Phosphorus contributes to energy transfer; more of it does not force a particular growth habit. Protect fresh shoots from late frost and drying winds.
Understanding plant feeding
How nutrients enter your Japanese maple
Fine roots connect Japanese maple to the soil. They need even moisture and oxygen. After uptake, dissolved nutrients can travel with water towards the crown. Foliar application is another way to use this concentrate. Both routes belong to a shared feeding plan.
Select a point in the picture or choose a stage.
Stage 01 / 04
The solution reaches the maple root ball
Apply the fully diluted mixture to the previously moistened root zone. The solution reaches the contact surfaces between soil and fine roots.
Good to knowCheck root-ball moisture before treating wilted leaves as a reason to feed.
A closer look
The first step is contact between dissolved nutrients and receptive root areas. The diagram represents this function, not a species-specific tissue section. Check root-ball moisture before treating wilted leaves as a reason to feed.
Stage 02 / 04
Uptake at the fine roots
Fine roots and root hairs increase contact with the growing medium. Dissolved nutrients enter root cells through regulated processes.
Good to knowFresh compost and existing soil reserves already contribute to nutrition.
A closer look
Root hairs increase the contact area. Transport across cell membranes must be distinguished from the movement of water itself. Fresh compost and existing soil reserves already contribute to nutrition.
Stage 03 / 04
Root cells regulate uptake
Cell membranes and transport proteins regulate the entry of dissolved nutrients. Water movement and nutrient uptake are distinct processes.
Good to knowA stronger concentration does not compensate for damaged roots.
A closer look
Regulated steps in living root cells lie between the surface and conducting tissues. Individual functional blocks do not represent the complete root anatomy. A stronger concentration does not compensate for damaged roots.
Stage 04 / 04
Onwards through the wood into the crown
After uptake, water and dissolved nutrients can move through the xylem towards shoots and leaves. Supply also depends on healthy roots and suitable growing conditions.
Good to knowA naturally compact habit does not mean the concentration should be increased.
A closer look
Xylem transports water and dissolved substances. Uptake and onward movement also depend on root health and growing conditions. A naturally compact habit does not mean the concentration should be increased.
Stage 01 / 04
The mixture wets maple leaves
Distribute the fully diluted solution as a fine spray over leaf surfaces. Avoid open flowers and follow the specified application conditions.
Good to knowFoliar applications count towards the same feeding plan as root applications.
A closer look
The leaf surface must make contact with the diluted solution. Wetting is the first step, not evidence that nutrients have already been absorbed. Foliar applications count towards the same feeding plan as root applications.
Stage 02 / 04
Across the protective leaf surface
The leaf surface protects living tissue. Dissolved nutrients can cross it; leaf age and application conditions affect the amount absorbed.
Good to knowFinely divided or red maple foliage does not require a different spray concentration.
A closer look
Nutrients can cross the protective cuticle; routes involving stomata may also contribute. Their role depends on species and conditions. Finely divided or red maple foliage does not require a different spray concentration.
Stage 03 / 04
Use within living leaf cells
Nutrients that enter a leaf can be taken up by its cells and used in metabolism. A visible droplet alone is not evidence of uptake.
Good to knowRed cultivar foliage and normal autumn change are not deficiency diagnoses.
A closer look
After crossing the surface, nutrients can be taken up by living leaf cells. The amount also depends on the nutrient and environmental conditions. Red cultivar foliage and normal autumn change are not deficiency diagnoses.
Stage 04 / 04
Use and possible redistribution
Whether nutrients move from a leaf to other parts depends on the nutrient and the maple’s condition. This does not imply a particular leaf or autumn colour.
Good to knowMore fertiliser does not automatically produce a desired leaf colour.
A closer look
Whether and how far nutrients move from a leaf to other parts varies between nutrients. Immediate supply to the whole plant cannot be inferred from this. More fertiliser does not automatically produce a desired leaf colour.
Development influences requirements
Distinguish establishment, new growth and leafless dormancy
Establishment & young maples
After planting, secure suitable moisture and root space. Fresh compost may already contain fertiliser; subsequent feeding depends on its nutrient reserves and the plant’s condition. No separate young-plant dilution stage is specified for this concentrate.
Leaf and shoot development
Feed at the stated interval during active growth. A naturally compact or weeping habit does not call for stronger feeding. New leaves are sensitive to late frost, heat and wind.
Autumn and leafless winter dormancy
Acer palmatum sheds its leaves after autumn colouring. Do not feed during dormancy. Japanese maple overwinters outdoors; potted roots and new shoots need protection according to the weather.
Consider cultivar traits, root condition and previous nutrition together. Natural growth habit and annual leaf change help distinguish normal development from care problems.
Application & calculator →Your growing conditions matter
Where does your Japanese maple grow?
Light shade and shelter from drying winds suit many cultivars. Pale, finely divided foliage can be sensitive to hot midday sun. Soil, container and crown form also affect care requirements.
Pots · root-ball moisture and drainage
Use a suitable pot with open drainage holes. Keep the root ball evenly moist without persistently wet compost. Check more often in warm, windy weather; the fertiliser concentration stays unchanged.
Garden · crown space and soil
Provide humus-rich, free-draining soil and space for the cultivar’s crown. Retain the previous planting depth; do not bury the trunk base or graft. Account for existing soil nutrients before adding fertiliser.
Winter & late frost · provide targeted protection
As a deciduous woody plant, Japanese maple stays outdoors. Protect containers from severe freezing and cold wind while keeping drainage open. Check moisture on frost-free days; protect young spring leaves when late frost is forecast.
Repotting & careful pruning
Increase root space when needed near the start of growth, preserving healthy roots and planting depth. Account for existing fertiliser after repotting. Make only necessary branch corrections; follow the plant profile’s pruning guidance and avoid major interventions.
For your maple’s root zone
Tree & Shrub Compost is the existing woody-plant growing medium for the next planting or repotting. Account for its existing fertiliser and conditions at the site.
-
Tree & Shrub Compost
€8,90 View product10 litres of Tree & Shrub Compost. Review nutrient supply after about 4–6 weeks and add fertiliser only if needed.
Understand plant care problems
What is changing on your Japanese maple?
Crisp leaf edges, leaf loss or suddenly wilting branches have different causes. Check root-ball moisture, drainage, sun, wind and frost. With one-sided wilting, have the roots and affected branches assessed as well.
Crisp leaf edges
Often a response to sun, wind or uneven moisture. Check the site and rootball before assuming a pest.
Vine weevil in pots
Check leaf notches and declining root stability separately: adults eat leaves while larvae can damage roots.
Suddenly wilting branches
One-sided wilt can involve root problems or verticillium. Wilting leaves alone do not prove drought.
Advice for your Japanese maple
These details help assess growing conditions, root problems or a possible infestation:
- Photos of the whole crown, both sides of affected leaves, branches and the base of the trunk.
- Cultivar, plant size, container or garden, light and wind exposure, growing medium and the last planting or repotting date.
- When changes began and how they developed, root-ball moisture, hot days or frost, recent pruning and previous fertiliser or care products.
Brown leaf edges prove neither nutrient deficiency nor pest attack. Notched edges can indicate beetles; root damage needs separate assessment. With suddenly wilting branches, have root problems or verticillium investigated professionally.
Confirmed mixing partners
These four plant-care products can each be mixed individually with our Maple 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 Japanese maples. The linked plant knowledge concerns Acer palmatum, including finely divided laceleaf cultivars, not every Acer species.
How do I dilute the concentrate?
Dilution: 5 ml per 2 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: 100 litres of diluted solution
- 500 ml – twin pack (2 × 250 ml): 200 litres of diluted solution
- 1 litre: 400 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 Maple Fertiliser’s product-specific dilution in the calculator. It does not establish an additional young-plant stage or a weekly bonsai feeding schedule.
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