When to Plant Sweet Potato in Brisbane, Subtropical Guide
Sow September to January. Right now in September you can sow.
Also called kumara.
Published · Last reviewed · By Garden Buddy
Growing advice is reviewed by hand. Planting dates, current conditions and prices on this page update daily.
This Sweet Potato guide is written for the Subtropical zone, which takes in Brisbane, the Gold Coast and the Sunshine Coast. Somewhere else? Your postcode picks the right one.
Not your zone? Cairns Sydney Melbourne Canberra Alice Springs Perth
Also handy: will it frost this week? and what grows in shade.
Photo: Wikimedia Commons
Sweet potatoes are a warm-season, frost-tender crop grown from vine cuttings (slips), not seed. They are highly productive in warm Australian climates, with a single plant producing 2-5 kg of tubers. Beauregard (orange flesh) dominates Australian production. Tropical and subtropical zones are ideal; temperate growers need warm microclimates and season-extension techniques.
Planting Calendar for Subtropical
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | - | - | - | - | - | - | - | D | D | D | D |
S = Seed Tray T = Transplant D = Direct Sow
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How to Grow Sweet Potato in Subtropical Australia
When to Plant
Plant September-January. Slips need soil above 18C. Harvest February-May (4-5 months after planting). In SEQ, planting from October to December is safest.
- Soil
- Well-drained, loose, sandy loam. Avoid heavy clay or waterlogged soil. Do not over-fertilise. Rich soil produces excessive vine growth at the expense of tubers. Slightly raised mounds or ridges improve drainage and warming.
- pH Range
- 5.5-6.5
- Sunlight
- Full sun (minimum 6-8 hours). Heat-loving crop. The more warmth the better.
- Spacing
- 35cm apart, 100cm between rows
- Watering
- Water regularly during establishment (first 3-4 weeks). Once vines are growing strongly, reduce watering. Sweet potatoes are surprisingly drought-tolerant once established. Excessive watering encourag
Companion plants: Beans, Corn, Sunflower
Avoid planting near: No significant antagonisms, but vines will smother nearby low-growing crops
Subtropical Growing Tips for Sweet Potato
Recommended Varieties
- Beauregard
- Northern Star
- Kestle
- Orleans
Key Challenges
- Weevil pressure from November onwards
- Frost risk for late-harvested crops
- Vine growth can be excessive in rich soil
Pro Tips
- Plant slips October-November in SEQ for best results
- Keep soil mounded over developing tubers to exclude weevils
- Do not over-feed. Lean soil produces better tubers
Harvesting Sweet Potato
When ready: Foliage begins to yellow (4-5 months after planting). Leaves may show autumn colour change. Scratch soil near a plant to check tuber size. In frost-prone areas, harvest before first frost as frost kills vines and can damage tubers.
How to harvest: Cut back vines first. Use a garden fork inserted 30-40cm from the plant base to loosen soil. Lift very carefully. Sweet potato skin is thin and damages easily, and wounds lead to storage rot. Sort into damaged (use immediately) and undamaged (for curing and storage). Do NOT wash before curing.
Worth growing?
A 2.4 m × 1.2 m bed fits 6 plants, about $40 worth at today’s Aldi and Woolworths prices, checked today.
That is roughly 9 kg at $4.44 a kilo.
Draw your sweet potato bed → No account needed.
Common Sweet Potato Pests in Subtropical Zones
Organic prevention: Use only clean, weevil-free planting material. Crop rotation (do not plant sweet potato in the same area for 3-5 years). Remove ALL crop residues and vines after harvest, this is critical. Earth up mo
Where to next
Supermarket Price
Current average retail: $4.44/kg (12-month range: $2.99–$4.90)
Grow your own and save on grocery bills.
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Open the planting dashboard Join Garden BuddyCommon Questions About Sweet Potato
When do you plant sweet potato in Australia?
It depends on your climate zone, not the calendar month alone. Planting months by zone:
- Tropical (Cairns): all year
- Subtropical (Brisbane): Jan, Sep to Dec
- Warm Temperate (Sydney): Oct to Dec
- Cool Temperate (Melbourne): Oct to Dec
- Cold / Highland (Canberra): Very marginal to impossible. Soil temperatures are rarely above 18C long enough. Only attempt in a protected greenhouse with soil warming.
- Arid / Semi-Arid (Alice Springs): Sep to Dec
- Mediterranean (Perth): Oct to Dec
Does sweet potato grow all year round in Brisbane?
No. In the Subtropical zone the planting months are Jan, Sep to Dec. Outside that window it either bolts, sulks or gets cut down by the weather.
What else is sweet potato called?
Sweet potato is the usual Australian name. Overseas seed packets and recipes call it kumara. Same plant, same growing advice.
Which zone am I in?
Type your postcode into the box under the heading and the page 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 Subtropical zone, Brisbane is its reference city.