When to plant Capsicum in Subtropical Australia

Subtropical zone — applies to Brisbane, Gold Coast, Sunshine Coast, Coffs Harbour, Lismore and similar areas. Growing elsewhere? Temperate · Cool · Tropical · Arid.

Sow capsicum direct from August through March in the subtropical zone, pressing seed 4 mm into warm soil. Germination takes 10–20 days and fruit follows in 70–110 days, so a spring sowing in Brisbane or on the Gold Coast is cropping before the December storms set in. Give plants full sun with 40–60 cm between plants and 80–100 cm between rows. Capsicum is frost tender, but in a largely frost-free climate the bigger question is heat management — a well-grown plant will often push through the mild winter and fruit again the following spring.

Sowing calendar — subtropical zone

Green months are your sowing window: August to March.

Growing notes

The subtropical capsicum year splits in two. An August or September sowing ripens its first fruit before the December–February wet, when storm damage, humidity and Queensland fruit fly all peak. A February or March sowing does the opposite, growing into the dry, mild autumn — many Brisbane gardeners find this late crop the cleanest of the year, with fruit colouring slowly through winter in frost-free suburbs. Midsummer sowings germinate quickly but ask young plants to survive the roughest weather of the year.

Soil wants to be rich and free-draining, with compost dug in and mulch to even out moisture. Irregular watering through hot spells causes blossom end rot, the sunken black patch on the fruit base; steady, deep watering fixes it.

The two failure modes to plan for are fruit fly and fungal spotting. Queensland fruit fly stings ripening fruit from late spring onwards; exclusion bags or fine mesh over the whole plant are the reliable answer, and picking at colour break helps. Bacterial and fungal leaf spots flare in humid storm weather — keep the full 40–60 cm spacing, water at the base in the morning, and strip affected leaves promptly.

Capsicum at a glance

Companion planting

Grows well with

Basil: Deters aphids; may improve flavour

Marigold: Deters nematodes and aphids

Common questions

When should I plant capsicum in Brisbane?

Sow direct from August through March. August–September sowings fruit before the summer wet season, while February–March sowings crop through the mild, dry autumn.

How long do capsicums take to grow from seed?

Seed germinates in 10–20 days and plants reach harvest in 70–110 days, so expect roughly three to four months from sowing to the first ripe fruit.

Why is my capsicum fruit rotting or full of maggots?

Maggoty fruit is Queensland fruit fly, at its worst from late spring through summer in the subtropics. Cover plants with fine exclusion mesh or bag individual fruit, and pick as soon as fruit starts to colour.

Do capsicums die off in winter in the subtropics?

Not usually on the frost-free coast. Capsicum is frost tender, but in mild-winter areas plants often survive, tick over slowly, and fruit again in spring; inland gardens that see light frost will lose them.

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