When to plant Celeriac in Temperate Australia

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

Raise Celeriac seedlings under cover from September to December, then transplant them out once they are sturdy and the soil has warmed. Seed is tiny and slow, germinating in 14–21 days at a bare 4 mm and needing light to sprout, so barely cover it. Space transplants 15–25 cm apart with 40–70 cm between rows. Celeriac is a long-haul crop, taking 90–140 days to swell its knobbly root, so an early start in Melbourne or Adelaide gives it the full cool-tailed season it prefers to finish well.

Sowing calendar — temperate zone

Green months are your sowing window: September to December.

Growing notes

Celeriac is hardy and actually improves in flavour after cool autumn weather, which suits temperate gardens from Perth to Newcastle. It is a thirsty, hungry crop that wants rich, moisture-retentive soil in full sun and steady, unbroken watering from transplant to harvest.

The number-one failure is stress checking the plants. Celeriac hates being dry, being transplanted too young, or sitting in cold soil early on. Any of these can trigger premature bolting, where the plant runs to seed instead of forming a bulb, or produces only a small, woody knob. Sow on time, keep the seedlings growing without a check, water deeply and mulch heavily, and never let the bed dry out through summer.

Unlike root vegetables, celeriac's swollen crown forms at the soil surface, so do not hill soil over it; instead, in late summer strip away the lower, outer leaves to expose the shoulders and encourage a rounder, cleaner bulb. Feed every few weeks with a balanced liquid fertiliser to sustain the long 90–140 day run. It stands well in the ground into the cool months, so harvest as needed once bulbs reach a useful size rather than lifting the whole row at once.

Celeriac at a glance

Common questions

Why is my celeriac not forming a bulb?

The usual cause is a growth check, such as drying out, transplanting too young, or cold early soil. Keep the plant watered and growing steadily from the start, as any stress makes it produce leaves and a small woody root instead of a full bulb.

When should I sow celeriac in temperate Australia?

Raise seedlings under cover from September to December and transplant once sturdy. Because it needs 90–140 days, an early spring start lets it finish into the cooler autumn, which improves flavour.

Do I need to hill up celeriac like potatoes?

No. The edible crown forms at the soil surface, so leave it exposed rather than covering it. In late summer, remove the lower outer leaves to expose the shoulders and encourage a rounder bulb.

How do I stop celeriac from being small and woody?

Give it rich soil, constant moisture and regular feeding across its long season. Small, tough roots almost always come from irregular watering or poor soil, so mulch heavily and never let the bed dry out.

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