When to plant Cauliflower in Tropical Australia

Tropical zone — applies to Darwin, Cairns, Townsville, Broome, Mackay and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Arid.

Cauliflower needs the earliest start of any tropical brassica: sow direct from March to July, 6 mm deep, with March and April sowings giving the best heads. At 100–160 days to maturity this is a slow crop, and the whole game in Townsville or Broome is landing curd formation in the coolest, driest months rather than the shoulder heat either side. Seedlings emerge in roughly six to twelve days. Choose a quick tropical variety, give each plant a generous 45–70 cm, and treat the timing seriously — cauliflower forgives less than broccoli or cabbage.

Sowing calendar — tropical zone

Green months are your sowing window: March to July.

Growing notes

The arithmetic drives everything with cauliflower. A crop that can take 100–160 days must be sown at the tail of the wet season if its curd is to form in the dry-season cool of June, July and August — which is why the window opens in March, before the monsoon has entirely finished. March sowings need insurance: raised beds or mounded rows so late downpours don't drown seedlings, and a temporary cover during the heaviest rain. By May and June you are sowing into settled dry-season conditions, but only fast varieties sown then will beat the October heat.

Soil should be firm, deeply composted and moisture-retentive, with plants at 45–70 cm in rows 75–90 cm apart — crowded cauliflowers make small curds. Water with complete regularity; a single severe drying, even for a few days, can abort curd formation, which is the most common failure here: big healthy leaves and no head. Prevention is even moisture, early sowing and a variety bred for warm climates. When curds do appear, bend a few outer leaves over them to keep sun off and hold the white colour. Cabbage white butterfly pressure is constant through the dry season, so grow the whole crop under exclusion netting rather than fighting caterpillars plant by plant.

Cauliflower at a glance

Companion planting

Grows well with

Nasturtiums: Trap crop; deters cabbage white butterfly

Marigold: Deters aphids and cabbage moth

Common questions

When should I sow cauliflower in tropical Australia?

Sow direct from March to July, with March and April preferred. The crop takes 100–160 days, so early sowings mature during the coolest part of the dry season.

Why does my cauliflower have big leaves but no head?

Heat or water stress has aborted curd formation. Sow earlier in the window, mulch, and keep soil moisture completely even from sowing to harvest.

Can you grow cauliflower in Townsville?

Yes, as a dry-season crop sown between March and July. Use a warm-climate variety and exclusion netting for cabbage white butterfly.

How far apart should cauliflower plants be?

Space plants 45–70 cm apart in rows 75–90 cm apart. Crowding is a common cause of small curds.

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