How to grow lemongrass
Overview
Lemongrass is a tropical perennial herb grown for its thick, aromatic stalks used in teas, curries, and stir-fries. It thrives in warm, frost-free climates and needs full sun and steady moisture to produce well.
Soil Preparation
Lemongrass prefers slightly acidic to neutral soil (pH 6.0–7.0). Enrich with well-rotted manure or compost before planting. Ensure good drainage; if soil is heavy clay, grow in raised beds or containers.
Growing Guide
Plant lemongrass in full sun in well-drained, fertile soil. Space clumps 60–80 cm apart. Water deeply once or twice a week, keeping soil moist but not waterlogged. In cooler zones, grow in pots to move indoors during frost. Mulch heavily to retain moisture and suppress weeds.
Care
Feed monthly with a balanced liquid fertiliser (e.g., 10-10-10) during the growing season. Cut back old, dead stalks to the base to encourage fresh shoots. Divide clumps every 2–3 years in spring to maintain vigour and prevent overcrowding.
Companion Planting
Plant lemongrass near chilli, ginger, and turmeric, which share similar sun and moisture needs. Avoid planting near fennel or beans, which may compete or inhibit growth. Lemongrass also repels some pests, making it a good border plant for vegetables.
Common Pests & Risks
Rust (Puccinia spp.) is common in humid conditions; improve air circulation and avoid overhead watering. Spider mites may appear in dry weather; spray with neem oil. Aphids can be washed off with a strong hose spray.
Harvesting
Harvest lemongrass stalks when they are at least 1 cm thick at the base and the plant is well-established, usually 3–4 months after planting. Cut stalks at ground level, removing the outer leaves. Use fresh or freeze for later use.
In the Kitchen
Use fresh lemongrass stalks in teas, curries, and stir-fries. Remove tough outer leaves and use only the tender inner part. Store fresh stalks in the fridge for up to 2 weeks, or freeze whole for longer storage. Crush or slice before adding to dishes to release flavour.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce water and improve soil. Brown leaf tips: low humidity or underwatering; mist plants and increase watering. Stunted growth: lack of nutrients; apply balanced fertiliser monthly. Rust: fungal disease in humid conditions; improve air circulation and remove affected leaves. Pests: spider mites in dry weather; spray with neem oil.