When to plant Brussels Sprouts in Cool Australia

Cool zone — applies to Hobart, Canberra, Ballarat, Orange, Armidale and similar areas. Growing elsewhere? Temperate · Subtropical · Tropical · Arid.

In the cool zone, sow Brussels sprouts direct from October through to February — spring and summer sowings that set plants up to mature into the frosty months, exactly when sprouts taste best. Seed sown 6 mm deep germinates in 6–12 days, and plants take anywhere from 80 to 140 days to reach picking size, so a December sowing in Ballarat delivers sprouts through winter. This is one of the few vegetables genuinely improved by frost, as cold snaps convert starches to sugars in the buttons. Give each plant 50–75 cm of space in rows about 90 cm apart.

Sowing calendar — cool zone

Green months are your sowing window: October to February.

Growing notes

Brussels sprouts are built for this climate — the frosty winters of Ballarat, Canberra and Armidale are precisely what sweetens them. The strategy is to sow within the October-to-February window so plants do their leafy growing through summer and begin forming sprouts as the weather cools; with 80–140 days to maturity, an October sowing of a long-season variety and a February sowing of a quick one can bracket the whole winter with harvests.

They are a long-occupancy crop and demand firm ground. Loose, freshly dug or heavily manured soil is the classic cause of blown sprouts — open, leafy buttons instead of tight ones — so plant into a bed firmed by treading, go easy on nitrogen once buttons start forming, and stake plants where tableland winds rock them. Water steadily through summer, because stressed plants stall and never quite recover.

Cabbage white butterflies will find seedlings within days in summer, and Brussels sprouts are a prime target. Exclusion netting over hoops from sowing day is far more effective than picking caterpillars off later. Beyond that: - Sow 6 mm deep; thin to 50–75 cm spacings, rows 90 cm apart - Pick from the bottom of the stem upward as sprouts firm - Leave plants standing through frost — flavour improves after each cold snap

Brussels Sprouts at a glance

Companion planting

Grows well with

Nasturtiums: Trap crop for cabbage white butterfly

Sage: Reduces diamondback moth pressure

Sage: UMN Extension research: reduces diamondback moth pressure

Common questions

When should I sow Brussels sprouts in a cool climate?

Sow direct between October and February. Plants take 80–140 days to mature, so these sowings grow through summer and produce sprouts through autumn and winter, when frost sweetens them.

Why are my Brussels sprouts loose and leafy instead of tight?

Blown sprouts are usually caused by loose soil or too much nitrogen. Plant into firm, settled ground, ease off high-nitrogen feeding once buttons form, and stake plants so wind cannot rock the roots.

Do Brussels sprouts need frost to taste good?

They do not need it to grow, but frost converts starches to sugars in the buttons, so sprouts picked after a few cold snaps taste noticeably sweeter. Leave plants standing through winter and harvest as you go.

How do I stop caterpillars eating my Brussels sprouts?

Cabbage white butterfly is the main pest, and exclusion netting over hoops from the day you sow is the most reliable defence. Check under leaves for eggs if plants have been uncovered.

When should I plant Brussels sprouts in Ballarat?

Any time from October to February. A December sowing works well in Ballarat, maturing into the frosty months when sprouts are at their sweetest.

Keep exploring