Cannabis requires different nutrients in different growth phases. Here is the complete timetable for optimum yields.
Cannabis requires different nutrients in different growth phases. Here is the complete timetable:
**Seedling phase (0-2 weeks)**
- Very few nutrients required
- EC value: 0.4-0.8
- pH value: 6.0-6.5 (soil) / 5.5-6.0 (hydro)
- Only water or weak root stimulator solution
**Vegetative phase (2-8 weeks)**
- Nitrogen-emphasised: NPK 3-1-2 ratio
- EC value: 0.8-1.4
- pH value: 6.0-6.5 (soil) / 5.5-6.0 (hydro)
- Additional: Calcium, magnesium, micronutrients
**Pre-flowering (1-2 weeks)**
- Start conversion: NPK 2-2-2
- EC value: 1.2-1.6
- Increase phosphorus slowly
- Reduce nitrogen
**Flowering phase (6-10 weeks)**
- Phosphorus-emphasised: NPK 1-3-2
- EC value: 1.4-2.0 (depending on variety)
- Final 2 weeks: Water only (irrigation)
- Potassium important for flower development
**Avoid common mistakes:**
- Over-fertilisation leads to nutrient blockages
- pH fluctuations prevent nutrient uptake
- Rinsing too late impairs flavour
- Do not forget micronutrients (zinc, iron, manganese)
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