Can you even grow Brussels sprouts in Brisbane?

It is possible but difficult, as the coast lacks a long cold season. Sow in February or March for the best shot, and expect better results in cooler inland districts.

When should I sow Brussels sprouts in the subtropics?

Sow direct from February to June, with early autumn plantings the most reliable. This gives the plants the full cool season they need to firm up.

How do I stop caterpillars ruining my sprouts?

Cover plants with fine exclusion netting from the start to keep cabbage white butterfly out. Check under the leaves regularly and remove any egg clusters or caterpillars by hand.

Why are my sprouts loose and leafy instead of tight?

Loose sprouts are caused by warm weather during development or too much nitrogen. Sow early enough that sprouting falls in genuinely cool weather and go easy on high-nitrogen feeds.

When to plant Brussels Sprouts in Subtropical Australia

Sow brussels sprouts in subtropical Australia from February to June. Method: raise seedlings,sow direct. Seeds germinate in 6-12 days, with harvest roughly 80-140 days after sowing.

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

Brussels sprouts are a winter gamble in the subtropics, so sow the seed direct from late summer into winter — February through June — and pin your hopes on the coolest months. They are hardy and genuinely need the cold to firm up tight sprouts, which makes them one of the trickier crops for coastal Brisbane and easier for growers in the cooler inland around Lismore. Seed germinates in 6 to 12 days, but this is a long haul at 80 to 140 days to harvest. An early autumn sowing is the safest bet, giving the plants a full run at the cool season before warmth returns and sprouts blow open.

Sowing calendar — subtropical zone

Green months are your sowing window: February to June.

Growing notes

The subtropical challenge with Brussels sprouts is simple: they want a long, cold season, and the coast barely provides one. Sow in February or March so the plants are large and established as winter's chill sets the sprouts; a June sowing risks running the crop into the warming spring, where sprouts loosen into leafy rosettes instead of firm buttons. Choose an open, sunny bed with rich, firm soil, and space plants 50 to 75cm apart with 90cm between rows, as these are tall, top-heavy plants that need staking in windy coastal gardens.

Cabbage white butterfly is relentless here, and the humid warmth extends its season well into the cooler months. The green caterpillars will shred foliage and burrow into developing sprouts, so cover plants with fine exclusion netting from transplanting and check regularly under leaves for clusters of eggs. Companion planting helps deter moths but netting is the reliable defence.

Humidity also brings downy mildew and grey mould, so water at soil level in the morning and never crowd the row. The classic failure is loose, open sprouts — almost always caused by too much warmth or over-feeding with nitrogen late on. Remove the growing tip once the lowest sprouts reach pea size to push the plant into filling out the rest.

Brussels Sprouts at a glance

Sowing depth	6 mm
Plant spacing	50-75 cm
Row spacing	90 cm
Germination	6-12 days
Days to maturity	80-140 days
Frost tolerance	Hardy
Method	Raise Seedlings,Sow Direct

Companion planting

Grows well with

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Common questions

Can you even grow Brussels sprouts in Brisbane?: It is possible but difficult, as the coast lacks a long cold season. Sow in February or March for the best shot, and expect better results in cooler inland districts.
When should I sow Brussels sprouts in the subtropics?: Sow direct from February to June, with early autumn plantings the most reliable. This gives the plants the full cool season they need to firm up.
How do I stop caterpillars ruining my sprouts?: Cover plants with fine exclusion netting from the start to keep cabbage white butterfly out. Check under the leaves regularly and remove any egg clusters or caterpillars by hand.
Why are my sprouts loose and leafy instead of tight?: Loose sprouts are caused by warm weather during development or too much nitrogen. Sow early enough that sprouting falls in genuinely cool weather and go easy on high-nitrogen feeds.

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