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 oleander. Understand growth and flowering.
Oleander (Nerium oleander) combines evergreen foliage with summer flowers. Find application guidance and deeper knowledge for containers, pruning and winter quarters. All parts of the plant are highly poisonous.
- Declared NPK
- 6.4 + 4.5 + 6.7With declared trace nutrients.
- Dilution
- 10 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.
Fits your care routine
For Nerium oleander
For Nerium oleander as a container shrub or trained standard. All plant parts are highly poisonous; treat it as an ornamental.
During active growth
For active growth, regularly April–September. Light, warmth and healthy roots are part of suitable nutrition.
Account for existing nutrients
Fresh pre-fertilised compost and previous feeds count towards nutrition. Investigate damaged roots or an unclear condition before adding feed.
Application in one place
Measure. Mix. Apply.
Oleander fertiliser calculator
Enter your water volume or use the height and width of one oleander as a rough watering guide. Choose the concentration by the plant’s development, not size alone.
Your water amountRough watering-volume guide
2.5 l
Matching concentrate amount
10 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 for watering the roots of one oleander only, not for foliar spraying. Measure height from compost level and crown width. Container volume, root-ball moisture, rooting, warmth and weather all matter. Use only when watering is needed; do not force the full guide volume.
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 your water volume. Select normal strength for established plants or half strength for young or sensitive plants; the size guide does not determine this choice.
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 shortage of flowers alone is not a reason to increase the dose.
Watering · through the roots
Moisten the root ball first, then distribute the mixture evenly over the root zone. A suitable container and free-draining compost must allow drainage. Do not feed a dry or persistently 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.
Properties & pack sizes Pack details for 250 ml and 1 litre
Net mass: 290 g for 250 ml; 1161 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 6.4 + 4.5 + 6.7
Declared nutrient percentages. Product pH: 6.9.
- 6.4% total nitrogen (N)
- 6% urea nitrogen
- 4.5% 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 Oleander Fertiliser can be mixed with Schädlings-Frei Organic, Trauermückenfrei Organic, KIRON Milben-Ex or Rosen Pilz-Frei BOCCACIO, one product at a time. The confirmation applies to fertiliser plus one named partner. Follow the specific directions and stricter conditions of both products.
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 oleander straightforward. Explore what the prepared mixture offers 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 tolerance when correctly applied accompanies leaf and shoot development. Balanced nutrition supports your oleander’s natural foliage appearance and growth.
Understand foliage quality and seasonal growth
Suitable nutrition supports leaf development and green foliage. Leaf finish means an even, well-kept appearance, not a shine coating. Light, warmth, water, cultivar and pruning also influence oleander growth and flowering.
Chelation binds metal ions and can reduce adverse effects of hardness; it does not remove calcium and magnesium from the water. The product pH of 6.9 describes the concentrate. The final mixture’s pH 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.
Flowers for patios and courtyards
Warm days. Flowering branches. Thoughtful care.
Narrow leaves line the long shoots, whose tips can develop flower clusters. A sunny, warm position and suitable watering matter alongside nutrition during active growth.
Support growth. Preserve developing flowers.
Our concentrate supplements mineral nutrition. Light, warmth, water and appropriate pruning remain part of care: extra fertiliser cannot replace sunshine or removed flower buds.
Narrow foliage accompanies new growth
Leathery leaves are often arranged in whorls of three around the shoot. New growth follows increasing light and warmth; evergreen foliage is gradually replaced.
Flower colour and fragrance depend on cultivar
Oleander carries its flower clusters in warm summer conditions. Cultivar, overwintering and weather affect the start. Double flowers suffer more in prolonged rain; keep foliar feed off open flowers.
A care routine starts at the root ball
Water and nutrient supply in a container depend on a confined root zone. Check moisture according to weather and plant condition, and allow for nutrients in the compost and previous feeds.
From the root zone to fresh shoots
How oleander grows and takes up nutrients
Roots take up water and mineral nutrients, while leaves use light to make sugars. Flowers and possible later follicles belong to the development cycle. Nutrient supply, light and water work together.
Roots · absorb & anchorAnchor the plant and explore the moist root zone.
Fine roots need moisture and oxygen. In a confined container, check the root ball according to weather and growth rather than watering by the calendar alone. Moisten dry roots with water before applying feed.
Leaves · capture energyNarrow evergreen foliage uses light to make sugars.
Leathery leaves are often arranged in whorls of three. Individual older leaves are continually replaced. Investigate heavy loss through light, water, roots and possible pests; evergreen leaves do not mean year-round feeding is needed.
Shoots · support and connectWoody shoots support foliage and flower clusters.
Vascular tissue connects roots and leaves. Thin selected older shoots and preserve healthy buds; shortening every tip can delay flowering. Wear gloves: all plant parts are highly poisonous.
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.
Understanding plant feeding
How nutrients enter oleander
The diluted mixture reaches roots in soil or containers during watering. Foliar application is also possible. Explore what happens from first contact to use within the tissues.
Select a point in the picture or choose a stage.
Stage 01 / 04
The nutrient solution reaches oleander 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
Cell membranes and their transport proteins regulate the uptake of dissolved nutrients in oleander roots. Substances are not simply washed unfiltered into the plant with irrigation water.
Good to knowMore fertiliser does not automatically mean better nutrition.
A closer look
Controlled steps in root tissue lie between contact with the root surface and onward transport. Transport across cell membranes helps oleander take up nutrients; water movement and nutrient uptake are different processes.
Stage 04 / 04
On to shoots and oleander 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
The diluted solution wets the oleander leaf
The fully diluted mixture wets the leaf surface. Avoid open flowers and spray only under suitable application conditions.
Good to knowOleander Fertiliser is also suitable for foliar application. Use only the fully diluted mixture, avoid open flowers 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 oleander 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
Oleander 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, flowering and winter rest
Establishment & young plants
After repotting, secure suitable root-ball moisture and drainage and account for existing fertiliser. According to leaflet 130405, start young and sensitive plants at half strength. A small established plant is not automatically young.
New shoots & summer flowers
Feed at the stated interval during active growth. Judge water needs by warmth, weather and container conditions; not every watering needs fertiliser. Do not automatically increase concentration after pruning or when flowers are scarce.
Moving indoors & winter rest
Do not feed during dormancy. Prepare bright, cool, reliably frost-free winter quarters. Check leaf undersides and shoots for pests before moving indoors; reintroduce direct sun gradually in spring.
Consider development, growing conditions and existing nutrients together. Oleander height determines neither its concentration stage nor its individual water needs.
Application & calculator →Your growing conditions matter
How do you care for your oleander?
Containers, repotting, pruning and winter quarters belong together. The dilution stays the same; water volume and actual feeding needs follow conditions and growth.
Container · sun, warmth and root space
Choose a sunny, warm, sheltered position. Use a stable container with drainage holes and suitable compost. Check the root ball more often in warm weather; do not derive water needs from fertiliser concentration.
Pruning · retain developing flowers
Wear gloves. When needed, shorten selected old or overlong stems low down while retaining other bud-bearing tips. Do not cut every branch to the same height. Pruning young plants for branching can delay flowering.
Winter quarters · bright, cool and frost-free
For container plants in Germany, overwinter reliably frost-free. Continue checking light, root-ball moisture and pests; less water than in summer may be sufficient. Do not continue feeding by a fixed calendar during dormancy.
Repotting · count nutrients in the compost
In spring, check whether the root ball needs more space. Repot into a suitable container when needed and retain the planting depth. Allow for fertiliser already in the fresh compost when planning further feeds.
Selected for oleander care
Suitable compost or a repotting set for the next container change. Allow for existing supplies and nutrients in the growing medium.
-
Oleander Compost
€8,90 View productOleander compost for the next repotting. Allow for existing nutrients when planning further feeding.
-
Oleander Repotting Set
€15,95 View product10 litres of oleander compost plus 250 ml of this concentrate. Allow for pre-fertilisation and fertiliser you already own.
Understand plant care problems
What is changing on your oleander?
Few flowers, yellow leaves or unusual shoots can have different causes. Check light, warmth, root-ball moisture and recent pruning before adding more feed or treating the plant.
Sap-feeding pests
Inspect young shoots and leaf undersides for aphids, scale or mealybugs. Check affected plants separately before overwintering.
Distorted, swollen shoots
Knobbly swellings and dark lesions can indicate oleander knot. Seek a diagnosis and keep pruning tools clean.
Few flowers
Check warmth, light and recent pruning first. Extra fertiliser cannot replace sunshine or removed flower buds.
Advice for your oleander
Photos and details of recent care help assess growing conditions, root problems or possible pests:
- Photos of the whole plant, leaf undersides and affected shoots; include buds and pruning cuts when asking about flowering.
- Cultivar, container size, growing medium, summer position, winter quarters and the date of the last repotting.
- When changes began and how they developed, root-ball moisture, recent pruning and previous fertiliser or plant-protection applications.
Leaf colour or a shortage of flowers alone does not identify a nutrient deficiency. Seek a diagnosis for knobbly swellings or dark changes on shoots. Establish the cause before choosing a treatment.
Confirmed mixing partners
These four care products can each be mixed with our Oleander Fertiliser. Follow the directions for both products.
-
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 Nerium oleander as a container shrub or trained standard. All plant parts are highly poisonous; treat it as an ornamental.
How do I dilute the concentrate?
Dilution: 10 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: 62.5 litres of diluted solution
- 500 ml – twin pack (2 × 250 ml): 125 litres of diluted solution
- 1 litre: 250 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 preparation and application. For oleander, use 10 ml per 2.5 litres of water. Use half strength for young and sensitive plants according to leaflet 130405, section 8; first test on one plant.
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