Choy Sum
Brassica rapa var. parachinensis
Fast-growing leafy brassica with edible stems and flowers; great for containers.
🌞 Light & Temperature
Light: Full sun to partial shade
Temperature: 22–32°C
🪴 Pot & Soil
Pot: 15–20 L pot; 2–3 plants per 30 cm planter.
Soil Mix: Rich, draining mix; pH 6.0–7.0
💧 Watering
Schedule: 2–3x/week
Amount: 1–2 L
Even moisture prevents bolting
🧪 Fertilizing
Type: Leafy veg feed
Frequency: Every 1–2 weeks
Dosage: Half-strength liquid weekly; or 10–15 g granular biweekly
🥕 Harvest
Start: 25–40 days from sowing
Duration: 3–5 weeks of cuttings
Harvest Indicators: Buds tight; stems crisp
Tips: Cut above node to encourage side shoots
🌱 Propagation
Direct sow or transplant
🐛 Pests & Diseases
- Caterpillars: Netting; Bt
🌦️ Seasonal Notes (Malaysia)
Grows well in cool/rainy months; provide shade in heat waves.
📝 Planting Notes
Space well for airflow.
💡 Extra Care Tips
- Mulch
- Harvest young for sweetness
Note
Schedules are guidelines—adjust for your microclimate, pot size, and weather. During heavy monsoon rain, reduce watering and improve drainage.