When to plant Celery in Temperate Australia

Temperate zone — applies to Sydney, Melbourne, Adelaide, Perth, Newcastle and similar areas. Growing elsewhere? Tropical · Cool · Subtropical · Arid.

Celery is one crop where raising seedlings genuinely pays off: in temperate Australia, sow into punnets from September through to February and transplant once seedlings are sturdy. The seed is tiny — cover it with barely 4 mm of mix — and slow, taking 15–25 days to germinate, so keep the punnets moist and don't give up early. From sowing, you're looking at 120–140 days to harvest, which makes this a genuine long-haul vegetable. What it wants above all is water: constant, generous moisture from seedling to harvest is the difference between crisp, thick stalks and thin, stringy, bitter ones.

Sowing calendar — temperate zone

Green months are your sowing window: September to February.

Growing notes

Celery carries a hardy rating, and mature plants shrug off the light frosts of a temperate autumn. Young transplants are a different matter — a run of cold nights early on can trick them into bolting to seed weeks later, so hold September-sown seedlings until conditions have settled, around the mid-October last frost, before planting out.

Sowing time sets your harvest season. September and October sowings transplant in late spring and cut in late summer or autumn; January and February sowings grow through autumn and come to harvest in the cool of early winter, which many growers find gives the crispest heads. Whatever the timing, allow the full 120–140 days.

This is the thirstiest, hungriest crop in the temperate garden. Plant into soil loaded with compost or aged manure, space plants 15–30 cm apart with rows 30–55 cm apart, mulch thickly, and never let the bed dry out. The classic failure — stringy, hollow, bitter stalks — is almost always water stress somewhere along the way, and no amount of late watering undoes it. A fortnightly liquid feed keeps growth moving.

For paler, milder stalks, blanch the stems in the last few weeks by wrapping them with cardboard or banking soil against them; self-blanching varieties skip this step.

Celery at a glance

Companion planting

Grows well with

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

Leeks: Similar growing conditions; efficient companion

Cabbage: Deters cabbage white butterfly

Common questions

When do you plant celery in Australia?

In temperate zones, sow into punnets from September through to February and transplant once seedlings are sturdy. Allow 120–140 days from sowing to harvest.

Why won't my celery seeds germinate?

Celery seed is naturally slow, taking 15–25 days even in good conditions. Sow it very shallow — about 4 mm — and keep the mix constantly moist for the whole wait.

Why is my celery stringy and bitter?

Water stress is nearly always the cause. Celery needs rich soil, thick mulch and constant moisture from transplant to harvest — even one dry spell shows up in the stalks.

Why is my celery bolting to seed?

Young transplants exposed to a run of cold nights often bolt later in the season. Plant out after the weather settles in mid-spring, and keep plants growing steadily with water and feed.

Keep exploring