When to plant Leeks in Subtropical Australia

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

Leeks have two direct-sowing windows in the subtropical zone: January to April, and again in August and September. Sow 10 mm deep, expect germination in 10–15 days, and settle in for the long haul — leeks need 105–120 days to fatten, which is why both windows point that growing run at the mild half of the year rather than the humid one. The autumn window is the main crop for most gardeners; the late-winter window gives a quicker follow-up that should be harvested before summer humidity brings rust into the bed.

Sowing calendar — subtropical zone

Green months are your sowing window: January to April and August to September.

Growing notes

Leeks are hardy and genuinely enjoy the subtropical winter, which is the whole logic of the sowing calendar. The January to April window is the main event around Brisbane and the Gold Coast: sow into the tail of summer and the crop fattens through the coolest, driest part of the year. The catch with the earliest sowings is the wet season itself — January and February seed beds can be flattened or waterlogged by storm rain, so use a raised, free-draining bed and be prepared to resow a washed-out patch. The August–September window gives a lighter, quicker crop maturing into early summer; harvest it promptly, because leeks standing into the humid months are far more prone to rust, the orange-pustuled fungal disease alliums cop in warm damp air. If rust appears, remove the worst leaves, widen spacing on the next sowing and rotate the bed away from other alliums for a season.

Sow in rows 20–30 cm apart and thin plants to 10–20 cm. As the shafts thicken, hill soil up around them progressively — that blanching is what turns a green stem into the long white barrel you actually want in the kitchen, and it is the step new leek growers most often skip.

Leeks at a glance

Companion planting

Grows well with

Carrot: Classic pairing — carrot fly repelled by leek, leek fly repelled by carrot

Carrot: Leek deters carrot fly; carrot deters leek fly — mutually protective

Celery: Both benefit from similar growing conditions; efficient space use

Common questions

When should I plant leeks on the Gold Coast?

Sow direct from January to April for the main winter crop, or in August and September for a quicker follow-up. The autumn window is the more forgiving of the two.

How long do leeks take to grow?

Allow 105 to 120 days from sowing, with germination in the first 10 to 15 days. They are a slow crop, which is why sowings are timed so the growing run lands in the mild months.

Why do my leeks have orange spots on the leaves?

Orange pustules are leek rust, a fungal disease that thrives in warm humid conditions. Remove the worst leaves, give plants more spacing for airflow, and avoid growing alliums in that bed the following season.

How do I get long white stems on my leeks?

Hill soil up around the shafts progressively as they thicken. Excluding light from the lower stem is what blanches it white; unhilled leeks stay green most of their length.

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