When to Plant Sweet Corn in Brisbane — Subtropical Guide
Photo: Wikimedia Commons
Sweet corn is a warm-season grass requiring block planting for wind pollination. Freshly picked corn is dramatically sweeter than shop-bought because sugars convert to starch within hours of picking. Requires significant space (minimum 4x4 block) and cannot be grown as single plants or rows.
Planting Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S/T/D | T/D | T | — | — | — | S | 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: 23.6°C (optimal range: 16–35°C) ✓ Ready to plant
How to Grow Sweet Corn in Subtropical Australia
When to Plant
September to February.
- Soil
- Deep, fertile, well-drained soil enriched with compost and aged manure. Heavy feeder.
- pH Range
- 5.8-7.0
- Sunlight
- Full sun (minimum 8 hours). No shade tolerance.
- Spacing
- 30cm apart, 60cm between rows
- Watering
- Deep water 2-3 times weekly. CRITICAL: increase at tasselling/silk stage - water stress causes bare cob patches.
Companion plants: Beans (Three Sisters), Pumpkin/Squash, Cucumber
Avoid planting near: Tomato (shared corn earworm)
Subtropical Growing Tips for Sweet Corn
Recommended Varieties
- Honey and Cream
- Golden Bantam
- Balinese
- Early Gem
Key Challenges
- Corn earworm
- Fall armyworm increasing
- January heat stress on pollination
Pro Tips
- Block plant 4x4 minimum
- Three Sisters works excellently in SEQ
- Bt on silks at first emergence
Harvesting Sweet Corn
When ready: Silks brown/dry. Cob full and firm through husk. Kernel exudes milky juice when pierced with thumbnail (milk stage).
How to harvest: Grasp cob, snap downward while twisting. Eat immediately - sugar converts to starch within hours.
Common Sweet Corn Pests in Subtropical Zones
Organic prevention: Remove old plants. Crop rotation.
Supermarket Price
Current average retail: $7.47/kg (range: $3.33–$21.67)
Grow your own and save on grocery bills.
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