When to Plant Kohlrabi in Sydney — Warm Temperate Guide
Photo: Wikimedia Commons
Kohlrabi is technically not a root vegetable - the edible part is a swollen stem that forms above ground. Fast-growing (55-70 days), mild-flavoured, and versatile in the kitchen, kohlrabi is an underused gem in Australian gardens. It thrives in cool weather, handles light frost, and is one of the best brassicas for beginners. Both the bulb and leaves are edible.
Planting Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S/T/D | S/T/D | S/T/D | T | — | — | S | S/T | S/T/D | S/T/D | S/T/D | S/T/D |
S = Seed Tray T = Transplant D = Direct Sow
Current Growing Conditions
Soil temperature: 19.3°C (optimal range: 10–30°C) ✓ Ready to plant
How to Grow Kohlrabi in Warm Temperate Australia
When to Plant
February to October. Year-round except hottest summer weeks. Two main windows: autumn (March-May) and spring (August-October).
- Soil
- Rich, well-drained soil with plenty of organic matter. Prefers neutral to slightly alkaline soil. Dig in compost and well-rotted manure before planting. Add lime to acidic soils (critical for preventing clubroot).
- pH Range
- 6.5-7.5
- Sunlight
- Full sun (6+ hours). Tolerates light shade, especially in warmer zones where afternoon shade prevents bolting.
- Spacing
- 20cm apart, 35cm between rows
- Watering
- Consistent, even moisture throughout growth. Water deeply 2-3 times per week. Inconsistent watering causes the stem bulb to become woody and split. Drip irrigation preferred.
Companion plants: Beetroot, Celery, Cucumber, Dill, Lettuce, Onion
Avoid planting near: Strawberry, Tomato, Runner Bean
Warm Temperate Growing Tips for Kohlrabi
Recommended Varieties
- White Vienna
- Purple Vienna
- Kolibri F1
- Winner
Key Challenges
- Summer heat causing bolting
- Caterpillar damage
- Clubroot in acidic soils
Pro Tips
- Sydney gardeners enjoy an extended kohlrabi season
- Spring and autumn crops are best
- Net against caterpillars - essential for clean crops
Harvesting Kohlrabi
When ready: Stem bulb is 6-8cm diameter (tennis ball size) for standard varieties. Bulb should feel firm and smooth. Harvest promptly - overgrown bulbs (>10cm for standard varieties) become woody and fibrous. Exception: Superschmelz stays tender up to 20cm.
How to harvest: Cut stem just below the bulb with a sharp knife, or pull the entire plant. Trim off leaves (save for cooking - they are edible). Trim the root.
Common Kohlrabi Pests in Warm Temperate Zones
Organic prevention: Net crops immediately after planting or sowing. Interplant with strong-scented herbs. Inspect leaf undersides for eggs every few days.
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