The product base
NPK 18-9-10 + 2% MgO and a complete trace-element package in fully coated granules.
Osmocote Pro (8-9M) 1KG
Normal price
€7,90
Controlled-release granular fertiliser
Osmocote Pro (8–9M) 1 kg
When one repotting needs to support a long growing cycle, Osmocote Pro (8–9M) provides a clear, organised solution. Mix it once and evenly through fresh growing medium; its fully coated granules then release NPK, magnesium and trace elements gradually for 8–9 months at 21°C. It is a practical choice for ornamentals, actively growing houseplants, shrubs and small trees in containers when you want reliable base nutrition with fewer repeat applications.
18–9–10NPK · % w/w
8–9 monthsNominal longevity · 21°C
2nd generationFully coated granules
1 kgGranular CRF
Composition & analysis
Complete nutrition for a long feeding cycle
The 18-9-10 formulation combines three nitrogen forms, phosphorus, potassium, magnesium and trace elements.
- Nitrogen forms: Total N 18.0% · nitrate 5.9% · ammoniacal 7.7% · urea 4.4%.
- 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 0.017% · Cu 0.041% · Fe 0.33% · Mn 0.046% · Mo 0.016% · Zn 0.02%.
Long-lasting nutrition
One correctly calculated repotting dose supports a substantial part of the growing cycle.
Complete base in every granule
NPK, magnesium and trace elements are distributed evenly through the growing medium.
Fewer repeat applications
Ideal for plants with a long active cycle when you want a simpler feeding routine.
For plants growing actively for months
Incorporate it into fresh growing medium before planting or repotting.
Repotting into a new pot
For even base nutrition from the start of the new cycle.
Houseplants
For actively growing plants, at a rate matched to their needs.
Shrubs & small trees
For containers that need a longer feeding period.
Long-cycle ornamentals
When the growing cycle is longer than a 3–4 month fertiliser programme.
Calculate the rate per litre of growing medium
Rates are based on unfertilised growing medium and should be adjusted for plant demand and climate.
- Mix before planting
- 3–6 g/L
- 8–9M at 21°C
- Reduce with supplementary feeding
3–3.5 g/L low · 3.5–4.5 g/L normal · 4.5–5.5 g/L high demand.
3–4 g/L low · 4–5 g/L normal · 5–6 g/L high demand.
For normal demand at 4–5 g/L, mix a total of 12–15 g.
16°C: 10–11M · 21°C: 8–9M · 26°C: 6–7M.
Incorporate evenly into fresh growing medium
Do not concentrate it in the planting hole or use it as a surface application. If water-soluble feed is added, reduce the Osmocote Pro rate accordingly. For houseplants, assess longevity from growing-medium temperature and actual growth rate.
Available packs
1 kg
1 kg pack for accurate measurement in g/L of pot volume.
Form
Fully coated granules
Second-generation granular fertiliser for even incorporation.
Storage
Seal partly used packs carefully and store in dry conditions.
Technical details
Long-cycle nutrition at a glance
Core analysis, trace elements and longevity by average growing-medium temperature.
Total N18.0%
P₂O₅9.0%
K₂O10.0%
MgO2.0%
16°C10–11 months
21°C8–9 months
26°C6–7 months
ApplicationIncorporation
Need a shorter cycle or an established-pot option?
Pro 3–4M suits shorter cycles after repotting, while Exact Tablets are designed for pots that are already planted.
Frequently asked questions
Answers on application, rates, longevity and combined feeding.
01How does it differ from Pro 3–4M?
Its nominal longevity is longer: 8–9 months at 21°C instead of 3–4 months.
02How much should I use?
For potted plants, official rates are 3–4 g/L for low, 4–5 g/L for normal and 5–6 g/L for high demand.
03Can I apply it on the surface?
Not as a standard topdress. Mix it evenly into fresh growing medium before planting.
04How long does it last in warmer conditions?
At 26°C, indicative longevity falls to 6–7 months.
05Can it be combined with liquid feed?
Yes, but the Osmocote Pro rate needs to be reduced accordingly.
06How should it be stored?
Keep it dry and seal the pack carefully after each use.