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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- For lemons, oranges and other citrus
- With chelated trace nutrients
- For root and foliar feeding
- 250 ml, twin pack or 1 litre
Start simply · explore when you want
Feed citrus. Understand its growth.
Citrus species are evergreen fruiting woody plants with different flowering and ripening times. Here, straightforward application meets deeper knowledge for the terrace, conservatory and winter quarters.
- Declared NPK
- 5.1 + 2.5 + 3.7With 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.
- Regular application period
- April–SeptemberApply only during active growth.
Product information
Application & dosageMix and apply to suit the growth stage.
Application in one place
Measure. Mix. Apply.
Dilution calculator for citrus plants
Enter your water volume or use the height and crown width of one citrus plant for a rough root-watering guide. The dose stage follows development, not tree size alone.
Your water amountRough watering-volume guide
2.5 l
Matching concentrate amount
5 ml
1 capful = 5 ml. Use a suitable measuring aid for smaller partial amounts.
Enter a water amount from 0.1 to 1,000 litres.
A rough guide only for root-watering one citrus plant, not for foliar spraying. Measure height from soil level and crown width. Pot volume, root-ball moisture, rooting, weather and location also matter. Use only when watering is needed; do not force the full guide amount and avoid standing water.
How the guide is calculated
General GREEN24 guide: height (m) × width (m) × 3–4 litres. Centimetres are converted to metres. Concentrate volume follows this fertiliser’s dilution and the chosen stage. The guide does not measure an individual plant’s water needs.
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 the appropriate dose stage. The size guide replaces neither assessment of plant development nor checking root-ball moisture.
Add some water first
Start by filling the container with part of the chosen water volume.
Shake & measure
Shake the bottle. 1 capful = 5 ml; use a measuring aid for smaller partial amounts.
Add the concentrate
Add the calculated amount of concentrate to the water.
Top up & mix well
Top up to the chosen water volume and mix well. Watering or spraying: see below.
When to feed? Every 1–2 weeks during active growth, regularly from April to September. Water as needed between feeds. Allow for nutrients in the compost and previous applications; pause during dormancy. A warm room alone does not justify an extra winter feeding programme.
Watering · through the roots
Moisten the root zone first, then distribute the mixture evenly. Excess water must be able to drain from the container. Check root-ball moisture and root development; do not feed into a dry or waterlogged root ball.
Spraying · onto the leaves
Lightly wet the leaves in the morning, evening or overcast conditions, avoiding open flowers. Root and foliar feeding count towards the same feeding schedule, not two parallel programmes.
Characteristics & pack sizesThe concentrate and its pack sizes at a glance.
Net mass: 275 g for 250 ml; 1099 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 |
Fits your citrus care routine
For Citrus species
For Citrus species such as lemon, orange and mandarin. Dilute this concentrate with water; do not equate it with ready-to-use citrus products.
During active growth
For active growth, regularly April–September. The plant is growing, the root ball is moist and water can drain.
Consider the root zone
Allow for existing feed after repotting. Investigate root damage, heavy leaf drop or an unclear condition before adding more fertiliser.
Beyond NPK · understand the formulation
Well mixed – available to leaves and roots
Water-soluble nutrients and coordinated formulation properties make feeding your citrus plant straightforward. Discover what the prepared 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 appropriately supports the development of new leaves and shoots. Balanced nutrition supports the natural foliage appearance of your citrus plant.
Understand foliage quality and seasonal growth
Appropriate nutrition supports leaf development and green foliage. Leaf finish means an even, well-kept appearance, not a sprayed-on shine. Light, water and roots also shape citrus growth; flowering and fruit development additionally follow species and cultivar traits.
Chelation binds metal ions and can reduce undesirable hardness effects; it does not remove calcium or magnesium from the water. The product pH of 6.8 describes the concentrate. The prepared mixture also depends on the source water; no fixed target pH is promised.
Use clean, suitable watering or spraying equipment. Measure the water and calculated concentrate quantity carefully.
Products
Pre-fertilised soil and fertiliser already in the root ball contribute to the nutrient supply. The products listed under “Mixable with this fertiliser” can each be mixed with this fertiliser. When applying them together, follow both products’ specific instructions; conflicting or stricter directions take precedence. Do not mix undiluted concentrates.
Our Citrus Fertiliser is mixable separately with Schädlings-Frei Organic, Trauermückenfrei Organic, KIRON Milben-Ex or Rosen Pilz-Frei BOCCACIO. This confirmation covers the fertiliser plus one of these products at a time. Follow the specific directions and stricter conditions of both products.
Nutrient composition · NPKDeclared nutrients and their forms.
Declared nutrient percentages. Product pH: 6.8.
- 5.1% total nitrogen (N)
- 5% urea nitrogen
- 2.5% water-soluble phosphate (P₂O₅)
- 3.7% water-soluble potassium oxide (K₂O)
- 0.005% boron (B)
- 0.002% copper (Cu) · EDTA chelate
- 0.03% iron (Fe) · EDTA chelate
- 0.006% manganese (Mn) · EDTA chelate
- 0.0005% molybdenum (Mo)
- 0.002% zinc (Zn) · EDTA chelate
GREEN24 · Plant knowledge
Citrus: glossy leaves, flowers and fruit
Light, water, temperature and root space help determine how citrus uses nutrients. Match care to the species, cultivar and actual growth.
Evergreen leaves in the light
Leathery leaves use light to produce sugars. Suitable moisture and well-aerated roots support nutrition alongside mineral nutrients.
Fruit ripens over many months
Some citrus plants carry flowers and fruit at different stages at the same time. Ripening takes time; adequate light and consistent watering remain important.
Matching products
-
Citrus Compost
€8,95 View productFor repotting citrus. Count the existing fertiliser; the compost label specifies further feeding after 4–6 weeks.
-
Citrus Repotting Set
€15,95 View product10 l citrus compost and 250 ml fertiliser together. Already includes this fertiliser.
-
Sneeboer Planting Trowel with Cherry Wood Handle
€54,95 View productFor adding compost and planting work in containers or beds.
-
Garden & planting bag Pro, 140 L
€10,90 View productFor collecting clippings and tidying up after plant care.
Growth & nutrient uptake
Leaves use light; roots take up water and mineral nutrients. The diagrams show how plant organs work together and how nutrients are absorbed.
How your citrus plant grows and feeds
Roots · absorb & anchorAnchor the tree and explore the moist root zone.
Fine roots need moisture and oxygen. The pot and growing medium limit available root space. Many citrus plants are grafted; the rootstock influences growth and suitability for particular conditions.
Leaves · capture energyEvergreen, leathery foliage uses light to make sugars.
Aromatic leaves supply growing shoots and fruit with sugars made through photosynthesis. In winter, light, temperature and root activity must fit together. Heavy leaf loss calls for investigation, not automatically more fertiliser.
Shoots · support & connectThe trunk and branches support the crown and connect the organs.
Vascular tissue connects roots, leaves, flowers and fruit. Young shoots may bear thorns; rootstock shoots below the graft union do not belong to the intended crown. Selective thinning retains potential flowering and fruiting shoots better than all-over clipping.
Nutrients · working togetherNitrogen, phosphorus and potassium for mineral nutrition.
Nitrogen supports chlorophyll and protein formation. Phosphorus contributes to energy transfer, while potassium supports water regulation and transport. The formulation supplements these minerals and declared micronutrients; it cannot replace suitable light and root conditions.
How nutrients enter your citrus plant
Select a point in the picture or choose a stage.
Stage 01 / 04
Nutrient solution reaches the citrus roots
The mixture reaches the soil around fine roots. Dissolved nutrients are available at the interface between roots and soil.
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 growing medium. Tiny transport proteins in the membranes surrounding root cells help dissolved nutrients enter the cells.
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
Root cells regulate uptake
In the roots of your citrus plant, cell membranes and their transport proteins regulate the uptake of dissolved nutrients. Substances do not simply flow unfiltered into the plant with the irrigation water.
Good to knowMore fertiliser does not automatically mean better nutrition.
A closer look
Between contact with the root surface and onward transport, controlled processes take place within the root tissues. Transport across cell membranes helps the citrus plant take up nutrients; water movement and nutrient uptake are distinct processes.
Stage 04 / 04
Onward to shoots and citrus leaves
Inside the root are fine transport channels called xylem. Water and absorbed nutrients can travel through them towards shoots and leaves.
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
Diluted solution wets the citrus leaf
The fully diluted mixture wets the leaf surface. Avoid open flowers and spray only under suitable application conditions.
Good to knowCitrus Fertiliser is also suitable for foliar application. Use only the fully diluted mixture and count the application towards the 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
Uptake across the citrus leaf surface
The leaf surface protects the plant. Dissolved nutrients can pass through this layer; tiny openings in the leaf may also play a part. Uptake varies with the type of leaf and the conditions.
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
Citrus leaf cells take up nutrients
Behind the surface lies living leaf tissue. Its cells can take up nutrients that have crossed the surface and use them for their activities.
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 within the leaf and possible redistribution
The plant can use absorbed nutrients within the leaf. Some can also reach other plant parts. This depends on the nutrient and the plant's condition.
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
Distinguish new growth, fruit development and rest
Establishment & young citrus plants
After repotting, secure suitable moisture and drainage and count nutrients already in the compost. Seedlings, cuttings and young grafts differ. A compact, established citrus plant is not automatically a young plant; half strength applies to young and sensitive plants.
New growth, blossom & prolonged fruit development
Feed at the stated interval during active growth. Citrus may produce several growth flushes; flowers and fruit can be present together. Do not automatically increase the dose after pruning or to encourage more fruit set.
Winter quarters & dormancy
Do not feed during the growth pause. Overwinter in very bright, frost-free conditions; the suitable temperature depends on the citrus species. Continue checking root-ball moisture, leaf undersides and shoot joints. A warm room alone does not justify an extra winter feeding schedule.
Consider development, location and existing nutrients together. The height of a citrus plant determines neither its dose stage nor its individual water needs.
Application & calculator →Growing conditions & care problems
Adapt care to the growing conditions and stage of growth. If you notice changes, check light, water and roots first — then take targeted action.
Where does your citrus plant grow?
Container · root space and drainage
Choose a sunny, sheltered summer position and gradually reintroduce direct sun after moving outdoors. Check root-ball moisture and allow excess water to drain. The container must be movable into winter quarters when needed.
Conservatory · balance light and temperature
Citrus species respond differently to winter temperatures. A bright, protected position can be suitable but must match the species and actual growth. Warmth with little light is not a sound reason for additional feeding.
Winter quarters · very bright and frost-free
Match winter temperature to the citrus species. Cool quarters usually reduce water use, but root-ball moisture still needs checking. Inspect leaves and shoots for scale insects, mealybugs and spider mites. Do not feed during the growth pause.
Repotting · count existing nutrients
Check root space and growing-medium structure in spring. Repot only when needed into a suitable container with drainage, retaining the planting depth. Pre-fertilised compost already supplies nutrients; follow its supplementary-feeding guidance.
What is changing on your citrus plant?
Scale insects and mealybugs
Regularly check shoot joints, leaf veins and sticky areas.
Spider mites
Check fine pale stippling and webbing on undersides, especially in winter quarters.
Yellow leaves
Do not automatically add iron: assess roots, moisture, light, temperature and feeding together.
Advice for your citrus plant
These details help assess growing conditions, root problems or a possible infestation:
- Photographs of the whole plant, both sides of affected leaves, shoot joints and graft union; include flowers and fruit for fruiting questions.
- Citrus species or cultivar, age and known rootstock, container size, growing medium, summer position and winter quarters.
- Onset and progress of changes, root-ball moisture, moves between locations, winter temperature and previous feeding or care treatments.
Leaf colour alone identifies neither a nutrient deficiency nor the amount of feed needed. Targeted soil or leaf analysis may help with unclear damage. Identify the cause before choosing a plant-protection treatment.
Mixable with this fertiliser
These 4 products can each be mixed with this 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.
PLANTS A–Z
Care for citrus through the year
Lemon, orange or kumquat: plan growing conditions, container care and winter quarters for the particular plant.
View the plant profile
PRACTICAL ADVICE
Why more fertiliser cannot solve everything
The law of the minimum explains how a factor in short supply can limit growth. More fertiliser cannot replace missing light, water or healthy roots.
Understand the law of the minimum
Quality products
Horticultural expertise
Our own production
Made in GermanyGREEN24's own products
Quick answers before you buy (FAQ)
Is this fertiliser suitable for my plant?
For Citrus species such as lemon, orange and mandarin. Dilute this concentrate with water; do not equate it with ready-to-use citrus products.
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.
- 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.
- 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.
Product GPSR safety information
The original leaflet explains safe mixing and application. Use this citrus concentrate’s product-specific dilution in the calculator. Use half strength for young and sensitive plants according to leaflet 130405.
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
Guides for this product
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