When to Plant Potato in Cairns, Tropical Guide
Also called spud.
Soil temperature is modelled from Open-Meteo forecast (Cairns), not a live sensor.
What this month normally looks like in Tropical
In October the Tropical zone normally runs 34°C by day and 23°C overnight, with about 53 mm of rain over 5 or 6 wet days. Averages 1991 to 2026, 37 postcodes, SILO.
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This Potato guide is written for the Tropical zone, which takes in Cairns, Townsville and Darwin. Somewhere else? Your postcode picks the right one.
Not your zone? Brisbane Sydney Melbourne Canberra Alice Springs Perth
Also handy: will it frost this week? and what grows in shade.
- Planting window
- Apr to Jun
- Days to harvest
- about 10 weeks
- Sun
- Full sun
- Water
- Regular
- Spacing
- 35 cm apart
- Soil pH
- 5.5–6.5
- Shop price
- $2.13/kg
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.
Published · By GardenBuddy.au
Planting dates, current conditions and prices on this page update daily.
Photo: Wikimedia Commons
Planting Calendar for Tropical
- Jan -
- Feb -
- Mar -
- Apr ✓
- May ✓
- Jun ✓
- Jul -
- Aug -
- Sep -
- Oct -
- Nov -
- Dec -
S = Seed Tray T = Transplant D = Direct Sow
Want a nudge when it is sowing time?
One email a week with what is worth planting in the Tropical zone right now, Potato included, plus which veg has jumped in price at the supermarket. Free, and you can stop it in one click.
How to Grow Potato in Tropical Australia
- Soil
- Well-drained, loose, fertile loam enriched with compost. Slightly acidic soil reduces scab. Avoid waterlogged or compacted soil. Do not lime potato beds.
- Salt
- Moderately sensitive. Copes with a little salt, but the harvest drops on salty bore water.
- pH Range
- 5.5-6.5
- 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.
- Good companions
- Nasturtium, Dwarf Beans, Sweet Corn, Basil, Marigold
- Keep away from
- Asparagus, Bitter Melon, Burdock, Capsicum (shares diseases), Cassava, Chickpeas, Cowpeas, Cucumber, Eggplant, Egyptian Spinach, Guava, Luffa, Peach, Pumpkin, Raspberry (share diseases), Rockmelon, Silverbeet, Summer squash, Sunflower (allelopathic inhibition), Tomato (shared diseases), Walnut (juglone sensitive), Watermelon, Zucchini
- Grow before it
- Leafy greens and brassicas (Lettuce, Silverbeet, Broccoli)
- Grow after it
- Roots and alliums (Carrot, Beetroot, Onion)
Give the bed 3 turns before nightshades go back in. Tomato, capsicum, eggplant and potato share wilts and blights that live on in the soil.
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
Pests and problems for Potato in Tropical
- Late Blight Late blight during wet season Watch
- Bacterial Wilt Bacterial wilt in wet soils Watch
- Early Blight Adequate nutrition (especially potassium and calcium). 3-year rotation. Mulch to prevent soil splash. Water at soil level, not overhead... Watch
- Tomato Potato Psyllid Watch
- Root-knot Nematode Watch
- Curl grub (scarab beetle larvae) Watch
- Common Scab Keep soil pH below 6.0 (do NOT lime potato beds). Maintain consistent soil moisture during tuber formation. Add sulphur to lower pH if... Watch
- Potato moth Potato moth is a critical pest year-round Watch
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.
Storing and preserving potato
How to keep it
- Cool Dark Storage. Cure freshly dug potatoes in a dark, well-ventilated area at 15-20C for 10-14 days to toughen skins. Then store at 4-8C in complete darkness. Paper bags, hessian sacks, or wooden crates with newspaper between layers. Never store in plastic. Check regularly for rot and remove affected tubers immediately. Keeps: 3-6 months depending on variety (some store 8+ months).
- Freezing. Peel and cut into chunks or mash. Blanch chunks for 4 minutes in boiling water. Ice bath, drain, freeze on trays then bag. Mashed potato freezes well with a knob of butter mixed in. Do not freeze raw potatoes. They turn dark and grainy. Keeps: 10-12 months.
- Dehydrating. Peel and slice thinly (3mm) or grate. Blanch 4-5 minutes. Pat dry. Dehydrate at 55-60C for 8-12 hours until brittle. Store in airtight jars. Rehydrate for soups, stews, or gratins. Keeps: 12 months in airtight containers.
- Canning (Pressure Canning Only). Potatoes are a LOW-ACID food and MUST be pressure canned. Water bath canning is NOT safe. Peel, cube, blanch 3 minutes. Pack into sterilised jars with hot water. Process at 10 PSI for 35 minutes (pints) or 40 minutes (quarts) in a pressure canner. Keeps: 12-18 months.
Canning safety. Low-acid vegetables like potato must be pressure canned, never water-bath canned.
Grow vs buy
A 2.4 m × 1.2 m bed fits 12 plants, about $26 worth at today’s Aldi, Coles, IGA and Woolworths prices, checked today.
That is roughly 12 kg at $2.13 a kilo.
Draw your potato bed → No account needed.
What potato costs in the shops right now, retailer by retailer, updated daily.
What members get
- Soil and weather from your nearest station
- An email when it's time to sow
- Your own garden plan, including planning from a photo
- Price history and price alerts
- Pest risk alerts for your area
- Full salt and canning detail
Common Questions About Potato
When do you plant potato in Australia?
It depends on your climate zone, not the calendar month alone. Planting months by zone:
- Tropical (Cairns): Apr to Jun
- Subtropical (Brisbane): Feb to Apr, Jul to Aug
- Warm Temperate (Sydney): Jan to Feb, Jul to Sep
- Cool Temperate (Melbourne): Sep to Dec
- Cold / Highland (Canberra): Sep to Dec
- Arid / Semi-Arid (Alice Springs): Feb to Mar, Sep
- Mediterranean (Perth): Feb to Mar, Jul to Oct
Can you grow potato all year round in Cairns?
No. In the Tropical zone the planting months are Apr to Jun. Outside that window it either bolts, sulks or gets cut down by the weather.
What else is potato called?
Potato is the usual Australian name. Overseas seed packets and recipes call it spud. Same plant, same growing advice.
When should I plant Potato in Cairns?
Plant certified seed potatoes only in the dry season, because tubers will not form well in hot soil. Early types like Ruby Lou are the safest bet, dug before the build-up heat.
What soil temperature do Potato need?
Potato germinate best when soil temperature is between 8°C and 25°C.
How do I know when Potato are ready to harvest?
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.
What are the best Potato varieties for Cairns?
Recommended varieties for the Tropical zone include: Sebago, Pontiac, Desiree, Coliban.
What grows well with Potato?
Good companion plants for Potato include: Nasturtium, Dwarf Beans, Sweet Corn, Basil, Marigold.
Are potato salt tolerant?
Only a little. Potato are moderately sensitive to salt, so the harvest drops on salty bore water. Mix salty water with rainwater, and mulch the bed.
Which zone am I in?
Type your postcode into the box near the top of the page and it tells you, and links this crop in your own zone if it differs. Or look it up on the grow zone map. This page is the Tropical zone, Cairns is its reference city.