How to Grow Cauliflower in Australia

Cauliflower is the most demanding brassica to grow and the most sensitive to growing conditions. Its ideal growing temperature is 10–18°C — too cold and the plant 'bolts' to button heads; too warm and it produces the same result. In most Australian climates, this means autumn to late winter is the cauliflower season.

Start seeds indoors 4–6 weeks before transplanting. Seedlings should be well established (6–8cm tall, stocky) before transplanting into the final bed. Handle roots carefully and water in with seaweed solution to reduce transplant shock.

Prepare the bed with generous compost, aged manure, and complete fertiliser — cauliflower is a heavy feeder. Plant at 60cm spacing (cauliflower becomes very large) and stake in windy positions. Water in well and mulch immediately.

Feed with a high-nitrogen fertiliser every 2 weeks during vegetative growth. Consistent watering is critical — never allow the plant to wilt. When the curd (white head) begins to form, tie the outer leaves over it ('blanching') to protect it from sunlight, which turns it yellow-green and slightly bitter. Use a rubber band or soft tie to hold 3–4 large outer leaves over the developing curd.

Choose reliable Australian varieties: 'All Year Round' is the standard; 'Graffiti' is a striking purple variety; 'Orange Bouquet' is a vivid orange. Coloured varieties need less blanching and are more striking on the plate.