Sawi

Full sun to partial shade. Sawi tolerates some shade (30% shade acceptable), making it suitable for inter-planting with taller crops. However, plants in full sun (6+ hours) produce more tender leaves and reach harvestable size faster than shaded plants.

15°C - 25°C. Like other brassicas, sawi is a cool-season crop that prefers temperatures below 25°C. It grows slowly and becomes tough/bitter in sustained tropical heat above 27°C. In Malaysia, plant during cooler months (Nov-Apr) or at higher elevations.

60% - 80%. Sawi handles high humidity well, unlike some leafy greens. Tropical humidity is actually beneficial, though good air circulation prevents fungal disease and improves leaf quality.

🌧️ Good news for Malaysia: Your home's natural humidity is already helping. Focus on airflow instead to prevent fungal issues.

Well-draining garden loam enriched with compost or organic matter. Sawi is a fast-growing leafy crop with high nitrogen demands. Incorporate compost or aged manure 2-3 weeks before planting. pH 6.0-7.5 is optimal.

Keep soil consistently moist but not waterlogged. Sawi grows quickly only with steady moisture and nitrogen availability. Fertilise every 2-3 weeks with nitrogen-rich fertiliser (or balanced NPK). Young seedlings benefit from diluted liquid fertiliser every 7-10 days.

💭 Still unsure? Stick your finger 2 cm into the soil. If it feels dry, water. If it's moist, wait. You'll get it right.

Sawi is grown primarily for the young leaves. Harvest by pinching off outer leaves when plants are 15-20cm tall, or cut the entire plant just above the soil line if you prefer. Usually a new crop will regrow from the base. Cut-and-come-again harvesting extends productivity from a single planting.

Seeds. Direct sow seeds 1cm deep in rows, spacing 20-30cm apart. Thin seedlings to 15-20cm spacing when 5-8cm tall. Germination occurs in 5-7 days in warm conditions.

Very high in vitamins A, C, and K. Contains glucosinolates (compound that breaks down into sulforaphane) which has been researched for potential anti-cancer properties. Fiber content supports digestive health.

Cooking (stir-fries, soups, braising. The Malaysian way of cooking sawi with oyster sauce is classic). Young tender leaves eaten raw in salads. Mature leaves used for cooking. Every part of the plant is edible and used.

Aphids cluster on undersides of leaves. Spray with neem oil or water blast them off. Diamondback moth caterpillars tunnel into leaves; use row covers on young plants or insecticidal soap. Cabbage butterflies lay eggs on sawi. Cover plants with fine mesh. Fungal leaf spots appear in humid, poorly-ventilated conditions.