When to Plant Celeriac in Canberra — Cold / Highland Guide

Celeriac

Photo: Wikimedia Commons

Celeriac is an underappreciated root vegetable that deserves more attention in Australian gardens. It produces a large, knobby, celery-flavoured root that is outstanding roasted, mashed, or in soups. It requires patience (120+ days), consistent moisture, and rich soil, making it a more advanced crop. Best suited to cool-temperate and cold-highland zones; struggles in tropical and subtropical heat.

Current Growing Conditions

Soil temperature: 18.9°C (optimal range: 15–21°C) ✓ Ready to plant

How to Grow Celeriac in Cold / Highland Australia

When to Plant

Start seed indoors August-September. Transplant November after last frost. Harvest April-June before hard frosts. Canberra and tablelands can grow excellent celeriac.

Soil
Rich, deep, moisture-retentive soil heavily amended with compost and well-rotted manure. Celeriac is a heavy feeder and demands fertile, humus-rich soil. Tolerates heavier soils than most root vegetables.
pH Range
6.0-7.0
Sunlight
Full sun to part shade (3-6 hours). Tolerates more shade than most root crops. In warmer zones, afternoon shade is beneficial.
Spacing
30cm apart, 45cm between rows
Watering
Celeriac demands consistent, generous moisture throughout its long growing season. Never let soil dry out. Water deeply 3-4 times per week. Drip irrigation ideal. Dry stress causes woody, hollow roots

Companion plants: Leek, Bean, Tomato, Cabbage, Cauliflower

Avoid planting near: Carrot, Parsnip (shares diseases), Corn

Cold / Highland Growing Tips for Celeriac

Recommended Varieties

  • Giant Prague
  • Monarch
  • Brilliant

Key Challenges

  • Short frost-free window is tight for 120+ day crop
  • Must start early indoors
  • Hard frosts will damage exposed roots

Pro Tips

  • Start seeds indoors in August with bottom heat - this is non-negotiable
  • Transplant after last frost (typically late October in Canberra)
  • Mound mulch or soil around roots in late autumn to protect from frost

Harvesting Celeriac

When ready: Root is 10-15cm diameter, visible above soil surface. Outer leaves begin to yellow and fall. Typically 120-150 days from transplant. Root should feel firm and heavy.

How to harvest: Use a garden fork to lever out the root. Cut off leaves and side roots. Trim the base. Do not wash if storing. The root should be the size of a large grapefruit or softball.

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