Schädlings-Frei-Organic
€16,95
For spraying or watering, depending on the authorised use. The method depends on the plant, pest and location.
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Choosing the right care
Dahlia Fertiliser
Dahlias bring colour to borders and containers from summer until frost. This liquid feed supplements nutrition during growth. Match feeding to existing nutrients and moisture around the roots; do not fertilise dormant tubers.
- Declared NPK
- 5.6 + 8.0 + 10.8Product-specific declaration with trace nutrients.
- Standard dilution
- 5 ml per 1.5 litres of waterEvery 1–2 weeks during growth.
- Application season
- May/June–SeptemberFeed only during active growth and according to need.
- Application
- Roots & foliageApply diluted only.
Fits your care routine
Species and site
Dahlias grow from swollen storage roots. Provide sunshine, well-drained soil and even moisture. Support tall cultivars early and remove faded flowers. Overwinter dormant tubers frost-free; do not water or feed stored tubers as if they were growing plants.
Dilute accurately
5 ml per 1.5 litres of water
Account for growth
Assess existing nutrients in borders; consider growth and initial compost feed in containers.
Easy application
Dahlia Fertiliser: correct dosage
Enter your water volume or estimate the amount from the size of your plant.
More calculations & plant age
Enter the water volume in litres. The calculator works out the concentrate needed. View application
Width and height give a rough guide for one root application. Choose m or cm. View application
Crown width and total tree height give a rough guide for one root application. View application
Enter the length and height of the whole hedge section. The result is for that section, not each plant. View application
Hydroponics needs product- and system-specific instructions. No permanent nutrient solution is calculated here. View application
Dosing equipment depends on flow, mixing ratio and device settings. This mode provides guidance rather than a universal dose. View application
3 litres · standard4 litres · Plus
* Severe deficiency, heavy feeders, intensified feeding. Increases the indicative application volume, not the concentration.
Please enter valid positive numbers. A comma or full stop can be used as the decimal separator.
Approximate amount of waterApproximate prepared solution10 L
Add concentrateConcentrate needed for this amount33.333 ml
Shake well before use. Add the concentrate and mix thoroughly.
5 ml per 1.5 litres of water
Choosing 3 or 4 litres changes the approximate amount of prepared solution to apply. The concentration is determined separately by the selected growth stage. Always mix according to the label.
A rough guide for one root application, not an exact water requirement: use your usual watering volume and the substrate’s capacity as a guide. Water the root zone first, then distribute the fertilizer solution evenly. This is not a spray volume for foliar feeding.
The calculated amount is for the entire hedge section entered, not for each individual plant.
Guide: plant width × plant height × 3 litres of prepared solution; for increased nutrient deficiency, × 4 litres. All dimensions in metres. Measurements entered in centimetres are automatically converted to metres.Guide for standards and trees: crown width × total tree height × 3 litres of prepared solution; for increased nutrient deficiency, × 4 litres. All dimensions in metres. Measurements entered in centimetres are automatically converted to metres.Guide for the whole hedge: hedge height × hedge length × 3 litres of prepared solution; for increased nutrient deficiency, × 4 litres. All dimensions in metres. Measurements entered in centimetres are automatically converted to metres.
Hydroponics
Hydroponics requires product- and crop-specific instructions. The watering dilution above is not a guide for a permanent nutrient solution. This calculator therefore does not calculate hydroponic doses, EC targets or top-up amounts for this fertiliser concentrate. Please discuss the product and your hydroponic system with our advisers.
Contact our advisers →Irrigation system / fertilizer injector
Dosing units, irrigation systems and fertilizer injectors need settings suitable for the product and equipment. Plant size alone cannot determine pump settings, running time or a stock solution.
- Establish the actual water flow and intended running time.
- Check injection ratio, suction and product suitability against the equipment and product instructions.
- Prepare a flow test with clean water according to the equipment instructions. Do not use the normal watering dilution as continuous injection without checking its suitability.
Product information
Application & dilution5 ml per 1.5 litres of water
One 5 ml capful per 1.5 litres of water. Every 1–2 weeks during growth; usual application season in Europe is May/June to September. Account for growth, need and existing nutrients.
- 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.
- Wear protective clothing, rubber gloves and safety goggles when mixing and applying. Use clean, chemically suitable tools and containers.
Original Leaflet 130405 – liquid fertiliser concentrates (PDF, German) ↗
PropertiesProduct characteristics and guidance
Net mass per 250 ml: 312 g.
A twin pack contains two bottles of 250 ml each.
Product pH: 6.7.
Nutrient compositionNPK 5.6 + 8.0 + 10.8
Declared percentages. Product pH: 6.7.
- 5.6 % total nitrogen (N); the label specifies 1.2 % nitrate nitrogen and 3.6 % urea nitrogen.
- 8.0 % water-soluble phosphate (P₂O₅).
- 10.8 % water-soluble potassium oxide (K₂O).
- Water-soluble trace nutrients: boron 0.01 %; copper 0.004 %; iron 0.02 %; manganese 0.012 %; molybdenum 0.001 %; zinc 0.004 %. Copper, iron, manganese and zinc are EDTA-chelated.
Mixing with other productsMixing, combining or applying separately
Using products as part of the same care routine is different from mixing them in one container. Follow the labels and application instructions of all products involved.
- Tank mixing: Combine products in a watering can or spray tank only when the manufacturer instructions confirm the specific combination and use. Do not mix undiluted concentrates together.
- Separate application: Applying products separately or at different times does not automatically establish compatibility. Check the species, location, plant condition and instructions for both products. No universal waiting period follows from this.
- Complementary products: A recommendation for suitable growing media, accessories or another care product does not mean that it may be mixed with the fertiliser.
- Plant protection products: The crop, target organism, application method and pack instructions must also be suitable. The fertiliser calculator does not calculate plant protection product quantities or confirm compatibility.
The recommendations cover products for different care tasks. Combining them in the same solution requires the instructions for both products to allow that combination. Otherwise, apply the products separately.
Enlarge image ↗
Thoughtful plant care
Support dahlias through the flowering season
Dahlias bring colour to borders and containers from summer until frost. This liquid feed supplements nutrition during growth. Match feeding to existing nutrients and moisture around the roots; do not fertilise dormant tubers.
Enlarge image ↗
From concentrate to nutrient solution
Mix carefully. Apply thoughtfully.
One 5 ml capful per 1.5 litres of water. Every 1–2 weeks during growth; usual application season in Europe is May/June to September. Account for growth, need and existing nutrients.
Calculate the amount →Mix, water or spray your fertiliser
Mix your fertiliser – step by step
Prepare the amount of nutrient solution you need. The dilution depends on this product and the required amount of water.
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Clean the container
Clean the watering can, sprayer or bucket and rinse it with clean water.
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Calculate the dose
Choose the amount of water you need and calculate the matching concentrate dose. The dosage calculator helps you do this.
Standard dilution: 5 ml per 1.5 litres of water
Calculate the right amount → -
Add some water
Pour part of the calculated amount of water into the container first.
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Shake, open & measure
Shake the closed bottle well. Then open it and measure the calculated concentrate dose with the dosing cap. Measure more than once if needed.
A full dosing cap holds 5 ml. Use suitable millilitre graduations for smaller amounts.
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Add the concentrate
Pour the measured concentrate into the water already in the container.
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Add the remaining water & mix
Add the rest of the calculated water and mix thoroughly. Your diluted nutrient solution is ready.
Dosage and water choice
Shake well before use. Choose the volume of water and measure the calculated concentrate dose. Pack size does not change the dilution.
Preferably use low-lime water or rainwater at 15–25 °C. Add the measured concentrate to the water and mix thoroughly. Never apply undiluted; prepare only what you need.
When applying the solution
Check growth, growing-medium moisture and previous feeding. Feed only during active growth.
Application season: May/June–September
For root feeding, moisten dry growing medium with water first. Check drainage; the pot should not remain standing in water.
Distribute the diluted solution over the pre-moistened root zone or spray the foliage. Do not spray open flowers. Do not apply in direct sunlight, below 5 °C or above 30 °C. Do not inhale spray mist.
Follow the safety instructions →Water the root zone
Moisten a dry root ball with water first. Apply the mixed fertiliser solution evenly to the compost and let excess water drain. Do not apply in full sun, below 5 °C or above 30 °C.
Spray the foliage
Mist the diluted solution onto the upper and lower leaf surfaces, avoiding open flowers. Do not apply in full sun, below 5 °C or above 30 °C. The same dilution applies here too; plant-size calculations are a guide for watering only.
Enlarge image ↗
Understanding nutrient supply
Two application routes. One care routine.
The diluted solution can be applied to the moist root zone or the leaf surface. Choose the appropriate route; the two methods do not justify two additional feeds. Explore how uptake works in the interactive explanation.
Explore root and foliar uptake
Understanding plant feeding
How do nutrients get into a plant?
Through the roots or through the leaves: explore four steps to discover how a plant takes up and uses nutrients.
Select a point in the picture or choose a stage.
Stage 01 / 04
Water carries nutrients to the roots
Dilute the fertiliser with water according to the label. Watering carries this nutrient solution into the soil or growing medium around the roots.
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
Roots take up dissolved nutrients
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
An inner layer controls the route
On their way into the root, nutrients meet a special layer of cells. It prevents substances from simply flowing through the gaps between cells and helps the plant control uptake.
Good to knowMore fertiliser does not automatically mean better nutrition.
A closer look
Nutrients move through the root tissues. The endodermis acts as a control layer: its barrier interrupts unrestricted movement along the cell walls.
Stage 04 / 04
Transport channels carry water and nutrients
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.
View original diagram ↗GREEN24 diagram with German labels
Stage 01 / 04
Diluted solution is applied to the leaf
For foliar feeding, diluted nutrient solution is sprayed onto the leaves. The product instructions tell you whether it is suitable for this use and how much to apply.
Good to knowSpray only as directed by the product instructions, never with undiluted concentrate.
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
Nutrients must cross the protective 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
Cells inside the leaf 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
Nutrients are used in the leaf and may move onward
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.
View original diagram ↗GREEN24 diagram with German labels
The plant behind the product
Discover dahlias
Dahlias grow from swollen storage roots. Provide sunshine, well-drained soil and even moisture. Support tall cultivars early and remove faded flowers. Overwinter dormant tubers frost-free; do not water or feed stored tubers as if they were growing plants.
View the plant profile →Coordinate fertiliser and compost
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Compost for Balcony & Flowering Plants
From €4,95 View productFor suitable container-grown dahlias; pre-fertilised, with further feeding after 4–6 weeks. Not a general border-soil amendment.
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Dahlia Repotting Set
€18,95 View productDahlia Repotting Set
Frequently asked questions
A question before you feed?
How do I dilute the concentrate?
5 ml per 1.5 litres of water. Normal: 100 %, young plants: 50 %, seedlings with leaves: 20 % of the standard strength under the GREEN24 standard.
When and how often should I feed?
One 5 ml capful per 1.5 litres of water. Every 1–2 weeks during growth; usual application season in Europe is May/June to September. Account for growth, need and existing nutrients.
How much solution does a pack make?
At 5 ml per 1.5 litres of water, 250 ml makes 75 litres of diluted feed; a twin pack makes 150 litres.
Can I feed through the leaves?
Yes, root and foliar feeding are possible. Apply diluted only, avoid direct sunlight and do not spray open flowers.
Should I feed immediately after replanting?
Not automatically. The linked flower compost is pre-fertilised; begin supplementary feeding after 4–6 weeks. Account for the dahlia’s needs and condition.
Should dahlias be fed in winter?
No. Dormant tubers do not receive fertiliser. Resume feeding after growth restarts, taking existing nutrients into account.
Understand care problems before treating
Plant protection advice
First establish what is causing the symptoms. Photos, growing conditions, root-ball moisture and recent care steps help when seeking advice.
Plant protection products and application
General manufacturer information: these products have not been selected here as suitable treatments for the plant shown here. Before use, check the plant species, pest, application site and current instructions.
Use plant protection products safely. Always read the label and product information before use.
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.
- Wear protective clothing, rubber gloves and safety goggles when mixing and applying. Use clean, chemically suitable tools and containers.
Wash your face and hands thoroughly. Use diluted fertiliser promptly and keep it out of water bodies and wastewater.
Storage
Dry · dark · above 8 °C to a maximum of 38 °C
Store dry and dark, above 8 °C and no higher than 38 °C. Keep out of reach of children and animals.
