When to plant Celeriac in Subtropical Australia
Subtropical zone — applies to Brisbane, Gold Coast, Sunshine Coast, Coffs Harbour, Lismore and similar areas. Growing elsewhere? Temperate · Cool · Tropical · Arid.
Raise celeriac seedlings and transplant through the cooler months, sowing from March to October so the crop grows on as subtropical humidity fades. Seed is fine and slow, germinating in 14-21 days, so sow it shallow at 4 mm in trays and keep it evenly moist. Transplant seedlings 15-25 cm apart in rows 40-70 cm apart. Celeriac is frost hardy and needs a long, steady 90-140 days of cool growth to swell its knobbly root, which is why an autumn-to-winter run through Toowoomba or the Sunshine Coast hinterland suits it far better than a hot, wet summer.
Sowing calendar — subtropical zone
Green months are your sowing window: March to October.
Growing notes
Celeriac wants a long, cool, unbroken run and consistent moisture, and in the subtropics the trick is fitting that into the calendar. The classic failure is bolting: any check from heat, drought, or a warm dry spell can send the plant to seed instead of forming a root. Sow from autumn, keep the water steady, and never let seedlings dry out, as celeriac is unforgiving of neglect.
The second problem is a small or forked root. This crop needs deep, rich, moisture-retentive soil and a full season to bulk up, so dig in plenty of compost before planting and feed through the season. Unlike root vegetables, celeriac's crown sits at soil level, so resist the urge to hill soil over it, which only causes rot.
A few pointers:
- Keep the bed weed-free; the seedlings are slow and easily outcompeted early.
- As the crown swells, remove a few outer leaves and any side roots to encourage a cleaner bulb.
- Mulch to hold moisture and even out soil temperature.
Harvest from late winter into spring once the swollen crown reaches a usable size. It stores well in the ground in the mild subtropical winter, so lift as you need it.
Celeriac at a glance
| Sowing depth | 4 mm |
|---|---|
| Plant spacing | 15-25 cm |
| Row spacing | 40-70 cm |
| Germination | 14-21 days |
| Days to maturity | 90-140 days |
| Frost tolerance | Hardy |
| Method | Plant Seedlings |
Common questions
- Why did my celeriac not form a bulb?
- Celeriac needs a long, cool season and steady moisture to swell its crown, and any check from heat or drought stalls it. Sow from autumn, keep the soil consistently moist, and grow it in rich soil so it has the full 90-140 days to bulk up.
- When should I plant celeriac in the subtropics?
- Sow from March to October so the crop matures through the cooler, drier months. A hot, wet subtropical summer causes bolting and rot, whereas an autumn-to-winter run gives celeriac the steady conditions it needs.
- How far apart do you plant celeriac?
- Space transplants 15-25 cm apart in rows 40-70 cm apart. This gives each plant room to build a good crown while keeping the bed productive, and the wider row spacing helps you keep the slow seedlings weed-free.
- Should I hill soil up around celeriac?
- No, unlike root crops the celeriac crown sits at soil level and should stay exposed. Hilling soil over it traps moisture against the crown and causes rot, so instead remove a few outer leaves as the bulb swells to keep it clean.
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