Coriander
Coriandrum sativum
Overview
Coriander thrives in NFT systems due to the constant availability of water and oxygen, which supports its fine root system. However, it is sensitive to heat and prone to 'bolting' (premature flowering), making temperature control in the reservoir and ambient air crucial for success.
Growing Requirements
pH Range
5.8 - 6.5
EC Range
1.3 - 1.8 mS/cm
TDS Range
650 - 900 ppm
Temperature
18°C - 24°C
Light Requirement
High (12 hours/day)
Nutrient Needs
Growth Timeline
Germination
7-10 daysSeeds are often split (scarified) before planting to improve rates. Keep moisture high and temperature around 20°C.
Seedling
10-14 daysTrue leaves appear. Transplant into the NFT channel once roots are long enough to touch the nutrient film.
Vegetative Growth
14-21 daysRapid leaf expansion occurs. Ensure adequate spacing in NFT channels as the canopy spreads.
Common Issues & Solutions
Bolting
- Elongated central stem
- Production of flowers
- Bitter taste in leaves
- High temperatures (above 24°C)
- Root stress
- Excessive light duration
- Maintain cooler reservoir temperatures
- Harvest frequently
- Reduce light cycle to under 12 hours
Pythium (Root Rot)
- Brown, slimy roots
- Wilting despite water availability
- Musty smell from reservoir
- Warm nutrient solution
- Low dissolved oxygen
- Light leaks in NFT channels
- Use a water chiller
- Increase aeration
- Ensure NFT channels are light-proof
- Use beneficial bacteria
Tip Burn
- Browning on leaf edges
- Dried out tips on new growth
- Calcium deficiency
- High humidity preventing transpiration
- EC too high
- Add Cal-Mag supplement
- Increase airflow over the canopy
- Lower nutrient concentration
Harvesting Guide
When to Harvest
Start harvesting when plants are about 6 inches tall and vigorous, usually around week 4.
How to Harvest
Use the 'cut-and-come-again' method by trimming the outer, older leaves first, allowing the center to continue growing. Alternatively, harvest the whole plant before it bolts.
Storage Tips
Store stems in a glass of water in the refrigerator loosely covered with a plastic bag, or wrap in damp paper towels.
Expected Yield
Moderate; expect 2-3 significant cuttings per plant before bolting occurs.
Photo Gallery
User Reviews
Reviews feature coming soon