When to Plant Potato in Cairns — Tropical Guide
Photo: Wikimedia Commons
Potatoes are Australia's most important vegetable crop and one of the most rewarding to grow at home. They are grown from certified seed potatoes (not true seed), produce generous yields in most climates, and store well. Planting times vary dramatically by zone, with subtropical growers planting in autumn/winter and temperate growers in spring.
Current Growing Conditions
Soil temperature: 25.2°C (optimal range: 8–25°C) ✗ Outside optimal range
How to Grow Potato in Tropical Australia
When to Plant
Plant March-August (dry season/winter). The cooler months are critical - potatoes will not tuberise well when soil temperatures exceed 25C. Harvest June-November.
- Soil
- Well-drained, loose, fertile loam enriched with compost. Slightly acidic soil reduces scab. Avoid waterlogged or compacted soil. Do not lime potato beds.
- pH Range
- 5.0-6.0
- Sunlight
- Full sun (minimum 6 hours)
- Spacing
- 35cm apart, 70cm between rows
- Watering
- Consistent moisture is critical during tuber formation (flowering stage). Water deeply 2-3 times per week during dry periods. Reduce watering as foliage yellows and dies back. Irregular watering cause
Companion plants: Beans, Peas, Horseradish, Marigold, Basil
Avoid planting near: Tomato, Eggplant, Capsicum (shares diseases), Pumpkin
Tropical Growing Tips for Potato
Recommended Varieties
- Sebago
- Pontiac
- Desiree
- Coliban
Key Challenges
- Soil too warm in summer for tuberisation
- Potato moth is a critical pest year-round
- Bacterial wilt in wet soils
- Late blight during wet season
Pro Tips
- Grow as a dry-season crop only - summer heat prevents tuber formation
- Heavy mulching to keep soil cool is essential
- Harvest promptly - do not leave tubers in warm soil
Harvesting Potato
When ready: Foliage yellows and dies back naturally. For 'new' potatoes, harvest when plants are flowering (about 10-12 weeks). For storage potatoes, wait 2-3 weeks after foliage has completely died to allow skins to set.
How to harvest: Use a garden fork inserted 30cm from the stem to avoid spearing tubers. Lift carefully and remove tubers by hand. Leave harvested potatoes on the soil surface for 1-2 hours to dry (no longer or they will green). Brush off soil but do not wash until ready to use.
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