How to grow chilli
Overview
Chilli (Capsicum annuum) is a warm-season vegetable grown for its fiery fruits, widely used in cooking. It requires full sun, warmth, and consistent feeding for a bountiful summer harvest. Frost will kill it, so timing is critical.
Varieties
- Jalapeño — Medium heat, thick flesh, excellent for pickling and salsas; popular in Australian gardens.
- Bird's Eye — Very hot, small fruits, widely used in Thai cooking and grows vigorously in warm climates.
- Cayenne — Long, slender fruits with moderate heat; ideal for drying into chilli flakes.
- Habanero — Extremely hot, fruity flavour, requires long hot season; a favourite for hot sauces.
- Anaheim — Mild, large fruits suitable for stuffing and roasting; tolerant of cooler nights.
Soil Preparation
Chilli prefers slightly acidic soil, pH 6.0-6.8. Enrich with well-rotted manure or compost before planting. Ensure soil is well-drained to prevent root rot; raised beds are beneficial in heavy soils.
Growing Guide
Sow seeds 5mm deep in seed-raising mix or direct sow after all frost risk. Space plants 40-50cm apart in well-drained soil enriched with compost. Provide sturdy stakes or cages as plants can become top-heavy. Pinch out early flower buds to encourage bushy growth. In cool regions, start indoors 6-8 weeks before last frost.
Sowing
Sow seeds 5mm deep in seed trays or direct in the garden after all frost risk. Germination takes 7-14 days at 22-30°C. Transplant seedlings when 10-15cm tall, spacing 40-50cm apart.
Care
Feed every 2-3 weeks with a balanced liquid fertiliser once flowers appear. Prune lower leaves to improve airflow and reduce disease risk. Mulch around the base to retain moisture and keep roots cool.
Companion Planting
Basil and oregano are excellent companions, repelling pests and enhancing flavour. Avoid planting near fennel, which may inhibit growth. Marigolds help deter aphids when planted nearby.
Common Pests & Risks
Aphids and mites are common; control with insecticidal soap or neem oil. Fruit fly damage can be reduced by using exclusion bags or nets. Remove infected fruit promptly to prevent spread. Keep the area weed-free to reduce pest harbourage.
Harvesting
Chillies can be harvested green or ripe, depending on desired heat. For maximum pungency, wait until fruits turn fully red. Use sharp scissors to cut fruits, leaving a short stem to prolong storage. Regular picking encourages continued fruiting.
In the Kitchen
Chillies add heat to fresh salsas, stir-fries, sauces, and curries. Store fresh in the fridge for up to 2 weeks or dry whole for long-term use. Handle with care to avoid skin irritation; use gloves when processing hot varieties.
Troubleshooting
Yellow leaves: usually nitrogen deficiency or overwatering; adjust feeding and check drainage. Blossom drop: caused by temperatures above 35°C or below 15°C; provide shade or wait for milder weather. Fruit rots: often due to anthracnose or sunscald; improve airflow and avoid overhead watering. Leggy seedlings: insufficient light; move to a brighter location. Poor fruit set: lack of pollination; hand pollinate or add pollinator-friendly plants nearby.