When to Plant Coriander in Sydney — Warm Temperate Guide
Photo: Wikimedia Commons
The most frustrating herb in Australia. Coriander bolts to seed at the first hint of warmth, making it a cool-season-only crop in most zones. Both the leaves (cilantro) and seeds (coriander spice) are useful. Understanding its biology is the key to managing bolting - this is NOT a herb that grows like parsley. It is a rapid-lifecycle annual that wants to flower and die as fast as possible.
Planting Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S/T/D | S/T/D | S/T/D | S/T/D | S/T/D | — | — | S/T/D | 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: 10–25°C) ✓ Ready to plant
How to Grow Coriander in Warm Temperate Australia
When to Plant
Best: March-May and August-September. Direct sow. Bolt risk high from October.
- Soil
- Rich, well-drained soil with compost. Consistent moisture critical.
- pH Range
- 6.0-7.0
- Sunlight
- Full sun in cool weather. Part shade essential in warm zones to delay bolting.
- Spacing
- 5cm apart, 20cm between rows
- Watering
- Keep consistently moist at all times. Any drought stress triggers bolting. Mulch to retain moisture and keep roots cool.
Companion plants: Dill, Chervil, Parsley, Lettuce
Avoid planting near: Fennel
Warm Temperate Growing Tips for Coriander
Recommended Varieties
- Slow Bolt
- Leisure
- Common coriander
Key Challenges
- Spring bolt window very narrow
- Autumn crop more reliable
Pro Tips
- Autumn sowing is the answer in Sydney
- Plants sown in April will produce well through winter
- Spring sowing is a gamble - one hot day triggers bolt response
Harvesting Coriander
When ready: Harvest leaves once plants are 10-15cm tall. Harvest before any sign of central flower stem elongation.
How to harvest: Cut outer leaves at base, leaving central growing point. Or cut entire plant 3cm above soil for regrowth (one regrowth only). For seed: let plants bolt, flower, and set seed until brown.
Common Coriander Pests in Warm Temperate Zones
Organic prevention: Fast-growing coriander usually outpaces aphid damage. Healthy plants resist better.
Supermarket Price
Current average retail: $27.18/kg (range: $24.92–$32.50)
Grow your own and save on grocery bills.
Get the Full Interactive Guide
Track your garden, get real-time pest alerts, and plan around your zone's weather.
Open the planting dashboard Join Garden Buddy