When to Plant Sweet Potato in Sydney, Warm Temperate Guide

Also called kumara.

Plant now in Warm Temperate

What this month normally looks like in Warm Temperate

In October the Warm Temperate zone normally runs 24°C by day and 13°C overnight, with about 66 mm of rain over 7 or 8 wet days. The coldest October night on record across the zone was -1.5°C, so a late frost is not out of the question. Averages 1991 to 2026, 153 postcodes, SILO.

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This Sweet Potato guide is written for the Warm Temperate zone, which takes in Sydney, Newcastle and Wollongong. Somewhere else? Your postcode picks the right one.

Not your zone? Cairns Brisbane Melbourne Canberra Alice Springs Perth

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

Planting window: Oct to Dec
Days to harvest: about 17 weeks
Sun: Full sun
Water: Low
Spacing: 35 cm apart
Soil pH: 5.5–6.5
Shop price: $4.90/kg

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.

Published 17 February 2026 · By GardenBuddy.au
Planting dates, current conditions and prices on this page update daily.

Photo: Wikimedia Commons

Best Planting Window for Warm Temperate

Jan -
Feb -
Mar -
Apr -
May -
Jun -
Jul -
Aug -
Sep -
Oct P
Nov P
Dec P

P = Planting window

Plant slips after the last frost, once the soil is above about 17C, into loose, free draining mounds. Hold back on fertiliser and dig the tubers once the leaves yellow in autumn, before the soil cools.

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How to Grow Sweet Potato in Warm Temperate Australia

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.
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 6-8 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 encourages vine growth over tuber development.
Good companions: Banana (ground cover), Sweet Corn, Sunflower, Ginger, Peanut
Keep away from: No significant antagonisms, but vines will smother nearby low-growing crops
Grow before it: Fruiting crops (Tomato, Capsicum, Zucchini)
Grow after it: Legumes (Beans - Dwarf, Peas, Broad Beans)

Give the bed 3 turns before root crops go back in. Roots fork and go leafy in fresh manure, so they take the bed after the heavy feeders have used it.

Members see the exact salt threshold, how much harvest it loses as salt rises, and what to grow instead. See what members get

Warm Temperate Growing Tips for Sweet Potato

Recommended Varieties

Beauregard
Northern Star
Evangeline

Key Challenges

Shorter warm season limits tuber size
Cool autumn may prevent full maturity
Establishing slips in marginal soil warmth

Pro Tips

Warm the soil with black plastic mulch 2 weeks before planting
Start slips indoors from August to have rooted slips ready for October planting
Choose a north-facing, sheltered position for maximum heat

Pests and problems for Sweet Potato in Warm Temperate

Members see each pest score and pest risk alerts for your area. See what members get

Browse the full pest library →

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.

Storing and preserving sweet potato

How to keep it

Curing and Storage. CURE first: place unwashed tubers in a warm (28-30C), humid (85%) space for 7-10 days. A covered box with damp towels in a warm room works. After curing, store at 13-15C in a dark, well-ventilated area. Do NOT refrigerate. Handle gently. Any skin damage shortens storage life. Keeps: 4-6 months if properly cured; 1-2 months uncured.
Freezing. Cook first (bake, boil, or steam until soft). Peel and mash or cut into chunks. Pack into freezer containers or bags. Do NOT freeze raw. The texture becomes unpleasant. Keeps: 10-12 months.
Dehydrating. Cook until just tender. Peel and slice into 5mm slices. Dehydrate at 55-60C for 8-12 hours until brittle. Store in airtight jars. Can be ground into sweet potato flour. Keeps: 12 months.
Canning (Pressure Canning Only). Sweet potato is a LOW-ACID food. Pressure canning ONLY - water bath is NOT safe. Peel, cube, pack into jars. Process at 10 PSI for 65 minutes (pints) or 90 minutes (quarts). Do not mash. Cubes only for safe heat penetration. Keeps: 12-18 months.

Canning safety. Low-acid vegetables like sweet potato must be pressure canned, never water-bath canned.

Members see the full pressure-canning detail for sweet potato (2 tested recipes). See what members get

Grow vs buy

A 2.4 m × 1.2 m bed fits 6 plants, about $44 worth at today’s Aldi and Woolworths prices, checked today.

That is roughly 9 kg at $4.90 a kilo.

Draw your sweet potato bed → No account needed.

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

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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

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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:

Tropical (Cairns): all year
Subtropical (Brisbane): Jan, Sep to Dec
Warm Temperate (Sydney): Oct to Dec
Cool Temperate (Melbourne): Nov to Dec
Cold / Highland (Canberra): Nov to Dec
Arid / Semi-Arid (Alice Springs): Oct to Dec
Mediterranean (Perth): Oct to Dec

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.

When should I plant Sweet Potato in Sydney?

How do I know when Sweet Potato are ready to harvest?

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.

What are the best Sweet Potato varieties for Sydney?

Recommended varieties for the Warm Temperate zone include: Beauregard, Northern Star, Evangeline.

What grows well with Sweet Potato?

Good companion plants for Sweet Potato include: Banana, Sweet Corn, Sunflower, Ginger, Peanut.

Are sweet potato salt tolerant?

Only a little. Sweet 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 Warm Temperate zone, Sydney is its reference city.