When to Plant Sweet Potato in Canberra, Cold / Highland Guide

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 Cold / Highland zone, which takes in Canberra, Cooma and Bright. Somewhere else? Your postcode picks the right one.

Not your zone? Cairns Brisbane Sydney Melbourne Alice Springs Perth

Also handy: will it frost this week? and what grows in shade.

Sweet Potato

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 Cold / Highland

Very marginal to impossible. Soil temperatures are rarely above 18C long enough. Only attempt in a protected greenhouse with soil warming.

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How to Grow Sweet Potato in Cold / Highland Australia

When to Plant

Very marginal to impossible. Soil temperatures are rarely above 18C long enough. Only attempt in a protected greenhouse with soil warming.

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

Cold / Highland Growing Tips for Sweet Potato

Recommended Varieties

  • Beauregard (if attempting)

Key Challenges

  • Insufficient heat units
  • Late spring and early autumn frosts bracket a very short window
  • Poor tuber formation

Pro Tips

  • Honest assessment: sweet potatoes are not suited to cold highland climates
  • A heated greenhouse with black plastic mulch is the only realistic approach
  • Consider growing in 200-litre black drums in full sun for maximum warmth

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.

Where to next

What sweet potato costs in the shops right now, retailer by retailer, updated daily.

Also worth sowing in the cold and highland zone this September: Sweet Corn, Beetroot, Chilli Peppers and Snow Peas.

The pest most likely to find your sweet potato: Rats and Mice.

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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Common 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:

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 Cold / Highland zone, Canberra is its reference city.