Holy Basil (Tulsi)
Ocimum tenuiflorum
Malay names: Selasih India, Tulsi

Fragrant sacred basil; heat-loving; great in Kratky/DWC with frequent harvesting.
๐ Light & Temperature
Light: Bright light to full sun (4โ6 h)
Temperature: 22โ36ยฐC
๐ชด Container & Medium
Container: Kratky jars or DWC; 2 inch net pots; per-plant reservoir 2โ5 L for Kratky.
Medium / Solution: Medium: clay pebbles/coco plugs; Solution: pH 5.8โ6.2, EC 1.0โ1.6 mS/cm
๐ง Watering / Solution Maintenance
Schedule: Top-up as needed (DWC); for Kratky, leave 3โ5 cm air gap
Top-up: Maintain EC while allowing air gap in Kratky
pH 5.8โ6.2; EC 1.0โ1.6 mS/cm
๐งช Nutrients
Type: Herb nutrient with micronutrients
Frequency: Check weekly; change 10โ14 days (DWC)
Dosage/EC: EC 1.0โ1.6 mS/cm; pH 5.8โ6.2
๐ Harvest
Start: 4โ6 weeks from sowing
Seasonality: Year-round
Duration: Continuous cuts
Harvest Indicators: Stems 15โ25 cm; strong aroma
Tips: Remove flower spikes to maintain leaf production.
๐ฑ Propagation
Seeds or softwood cuttings in water.
๐ Pests & Diseases
- Aphids/mites: Neem 0.5โ1%; prune for airflow; avoid over-N.
๐ฆ๏ธ Seasonal Notes (Malaysia)
Shelter from heavy rain; encourage airflow in monsoon.
๐ System Notes
Single plant per site; regular pinching keeps bushy.
๐ก Extra Care Tips
- Harvest weekly
- Rotate for even light
Note
EC and pH are guidelinesโadjust to plant response and your water source. In monsoon humidity, increase airflow and reduce overcrowding to limit disease.