Turmeric
Curcuma longa
Also known asIndian saffron · Curcuma · Haldi · Cúrcuma
Environment
The bounded range this crop tolerates.
Climate and zones
- USDA zones
- 9–13 (winter low around -7°C)
- Frost
- frost sensitive (dies at first frost)
- Season
- year-round tropical
Growing systems
Root mass: moderate.
Growing media
| Medium | pH effect | Retention | Bacterial surface |
|---|---|---|---|
| Soil-based mix (Potting soil) | varies | high | high |
| Coco coir (Coconut coir) | slightly acidic | high | moderate |
Nutrient demand by stage
NPK ratios are relative weights. EC targets shift through the plant's life.
| Stage | N | P | K | EC (mS/cm) |
|---|---|---|---|---|
| seedling | 2 | 1 | 1 | 1 |
| vegetative | 2 | 1 | 2 | 1.6 |
Companion-growing notes
- Heavy uptake of potassium. Co-grown crops with the same demand will end up deficient even at "correct" EC.
Aquaponics suitability
Compatible
Fish waste provides enough nitrogen for healthy growth. Supplemental potassium, calcium, and iron may still be needed depending on fish stocking density.
Care notes
A warm-weather rhizome crop with similar culture to ginger. Large container (15 L) or media bed with 15 cm of loose substrate. EC 1.5-2.5 mS/cm. pH 5.5-6.5. Temperature: 22–32°C (tropical; growth stops below 15°C). High humidity (60%+). Moderate to high light (DLI 14-22 mol/m2/day; tolerates partial shade). Propagation: buy fresh turmeric rhizome from a grocery store (choose organic, plump pieces with visible growth buds), plant 5 cm deep. Growth emerges in 2-4 weeks. Harvest the entire clump at 8-12 months when the leaves yellow and die back. Each planted rhizome piece produces a clump of 5-15 new 'fingers' of turmeric. Fresh turmeric is grated directly into dishes, blended into smoothies and golden milk, or juiced. For drying: boil rhizomes for 30-45 minutes (this cures them and prevents sprouting), dry in a dehydrator, then grind to powder. Warning: turmeric stains everything permanently. Wear gloves and use a dedicated cutting board.