The product base
NPK 19-9-10 + 2% MgO and trace elements in fully coated granules.
1
Osmocote Pro (3-4M) 500gr
Normal price
€4,50
Controlled-release granular fertiliser
Osmocote Pro (3–4M) 500 g
For a clear and easy feeding plan at repotting time, Osmocote Pro (3–4M) is a practical choice for plants entering an active growth phase. Once mixed evenly through fresh growing medium, its fully coated granules gradually release NPK, magnesium and trace elements for 3–4 months at 21°C, giving potted ornamentals, seasonal plants, shrubs and small trees a reliable nutritional base.
19–9–10NPK · % w/w
3–4 monthsNominal longevity · 21°C
2nd generationFully coated granules
500 gGranular CRF
Composition & analysis
Complete nutrition in every coated granule
The formulation combines nitrogen, phosphorus, potassium, magnesium and a complete trace-element package.
- Nitrogen forms: Total N 19.0% · nitrate 6.3% · ammoniacal 8.2% · urea 4.5%.
- Phosphorus & potassium: P₂O₅ 9.0% (6.8% water-soluble) · K₂O 10.0% (10.0% water-soluble).
- Magnesium: MgO 2.0%, of which 1.3% is water-soluble.
- Trace elements: B 0.01% · Cu 0.037% · Fe 0.30% · Mn 0.04% · Mo 0.015% · Zn 0.011%.
Steady nutrient release
The coating regulates nutrient release for a steady feeding pattern.
Complete base nutrition
Each granule contains NPK, magnesium and trace elements for even distribution.
For shorter growing cycles
The 3–4 month longevity suits active growth and spring repotting.
For repotting and active growth
Use it as base nutrition incorporated into fresh growing medium.
Spring repotting
Mix evenly into fresh growing medium before planting.
Fast-growing plants
For plants that need controlled nutrition over a shorter cycle.
Potted plants
With a rate matched to the plant's actual nutrient demand.
Bedding plants & annuals
For short crop cycles and vigorous seasonal growth.
Choose the rate for the plant
Official rates are based on unfertilised growing medium.
- Mix before planting
- Low demand 1–2.5 g/L
- Normal demand 2–4 g/L
- High demand 3–4.5 g/L
1.5–2 g/L low · 2–3 g/L normal · 3–4 g/L high demand.
1–2 g/L low · 3–4 g/L normal or high demand.
1.5–2.5 g/L low · 2.5–3.5 g/L normal · 3.5–4.5 g/L high.
At 3–4 g/L, mix a total of 9–12 g into the fresh growing medium.
Mix evenly — never apply as a concentrated pocket
Blend it thoroughly through the growing medium before planting. For houseplants, choose the rate according to actual growth and growing-medium temperature.
Available packs
500 g
A practical pack for measuring rates in g/L of pot volume.
Form
Fully coated granules
Second-generation controlled-release fertiliser for incorporation.
Storage
Seal the pack carefully and store it in dry, cool conditions.
Technical details
Composition and longevity at a glance
Key analysis values and the effect of temperature on longevity.
Total N19.0%
P₂O₅9.0%
K₂O10.0%
MgO2.0%
16°C4–5 months
21°C3–4 months
26°C2–3 months
ApplicationIncorporation
Different application or longer feeding?
Choose Exact Tablets for established pots, or Pro 8–9M for a longer feeding cycle after repotting.
Frequently asked questions
Answers on dosage, application, temperature and storage.
01What is Osmocote Pro 3–4M?
It is a fully coated NPK 19-9-10 controlled-release fertiliser with magnesium and trace elements.
02How much should I use?
Rates range from 1 to 4.5 g/L depending on the plant; normal demand is generally 2–4 g/L.
03How is it applied?
Mix it evenly into unfertilised growing medium before planting or repotting.
04How does temperature affect longevity?
It lasts 4–5 months at 16°C, 3–4 months at 21°C and 2–3 months at 26°C.
05Can it be combined with water-soluble feed?
Yes, but reduce the Osmocote rate to account for the additional nutrition.
06How should it be stored?
Seal the pack and keep it in dry, cool conditions.