How to Grow Chilli in Australia

Chillies are warm-season perennials in frost-free Australian climates, making them some of the most productive plants per square centimetre in the raised bed. In subtropical Queensland, Northern Territory, and Western Australia, established chilli plants can produce fruit for 3–5 years with proper pruning. In cooler southern climates, they are grown as annuals or overwintered in pots.

Sow seeds indoors at 26–30°C soil temperature — chillies germinate slowly in cool conditions and need warmth to thrive. Use a heating mat or propagator and expect germination in 14–21 days. Seedlings are slow to establish; start 10–12 weeks before your last frost date in cooler climates.

Transplant hardened-off seedlings when daytime temperatures are reliably above 20°C and nights above 15°C. Plant at 45cm spacing with stakes in place. Feed with a balanced fertiliser during vegetative growth; reduce nitrogen and increase potassium as fruit sets.

Chillies are heat-lovers that perform spectacularly in Australian summers. In very hot conditions (above 38°C), they may drop flowers temporarily but recover when conditions moderate. Mulch heavily to keep roots cool and retain moisture. In coastal areas with high humidity, ensure good airflow to prevent fungal disease.

In subtropical and tropical climates, chillies can be cut back hard at the end of the season and will reshoot vigorously. In temperate climates, dig up plants before frost and overwinter in pots indoors.