Sweet potato is one of the most productive, heat-tolerant, and low-maintenance crops for Australian raised beds. In subtropical and tropical Australia, it is an almost self-sufficient crop, plant the slips and largely leave them to it. The vigorous vines provide excellent ground cover, and both the roots and the young leaves are edible.
Plant Spacing
30 cm apart
90 cm between rows
Days to Harvest
90-130 days from slip planting
Germination: 14-21 days (slip development)
Sun Needs
Full sun (6+ hours daily)
Water Needs
Low to moderate once established, very drought-tolerant
Soil pH
5.5-6.5
Expected Yield
1-5 kg per plant
Planting times vary significantly across Australia's five climate zones. Find your zone below for the best planting windows.
| Climate Zone | Best Planting Months |
|---|---|
| Tropical (Darwin, Cairns) | Year-round; best September-December |
| Subtropical (Brisbane, Northern NSW) | September-December |
| Temperate (Sydney, Melbourne, Perth) | October-December |
| Cool/Alpine (Canberra, Hobart, high country) | October-November (challenging; short season) |
| Arid (Alice Springs, outback) | September-November with irrigation |
Not sure of your climate zone? Enter your postcode to get personalised planting advice.
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Sweet potatoes are grown from 'slips', rooted cuttings taken from sprouting tubers, not from seed. To produce slips, place a whole sweet potato half-submerged in water or in moist propagating mix in a warm location (25°C+). Shoots will emerge in 2-3 weeks; when shoots are 15-20cm long with roots visible, separate them from the mother tuber and plant directly.
Alternatively, buy slips from specialist nurseries or take stem cuttings (30cm long) from an established plant, sweet potato cuttings root extremely easily when placed in moist soil.
Sweet potatoes require a warm soil and long frost-free growing season. They thrive in heat and actually prefer slightly sandy, well-drained soil rather than heavy compost-rich beds, too much nitrogen produces impressive vines but small tubers. A moderate amount of compost is fine; avoid excessive fertiliser.
Spacing must account for the vine habit, vines can extend 3-5m. In raised beds, train vines vertically on a strong trellis or allow them to cascade over the bed edge and across the ground. Vertical growing in raised beds works surprisingly well, with the roots forming in the deep bed medium below.
Irrigating raised beds requires care, sweet potato is prone to root rot if soil is consistently wet. Water deeply but allow to partially dry between waterings.
Choose varieties suited to your climate: 'Beauregard' and 'Northern Star' are excellent for subtropical and tropical areas; 'Gold Rush' is well-suited to cooler climates; purple-fleshed 'Purple Haze' and 'Okinawa' are increasingly popular for their anthocyanin content.
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Plant Planner calculates how many sweet potato plants your family needs, assigns them to the right beds, and generates a personalised planting schedule for your climate zone.
These plants make excellent neighbours for sweet potato in your raised beds, they help deter pests, improve pollination, or enhance growing conditions.
Avoid planting sweet potato near these crops, they can inhibit each other's growth, attract shared pests, or compete aggressively.
Sweet potato weevil (Cylas formicarius) is a serious pest in tropical and subtropical Australia, tunnels into tubers and renders them inedible.
Monitor carefully; destroy affected tubers.
Root rot in waterlogged beds causes tubers to rot in the ground, ensure excellent drainage.
Sclerotial blight causes damping off at ground level in humid conditions, improve airflow.
Spider mites in hot, dry conditions cause leaf stippling; maintain soil moisture.
Harvest sweet potatoes 90-130 days after planting when the leaves begin to yellow or after a light frost kills the foliage. Carefully fork around the plant 30cm away from the base and lift gently, tubers can extend quite wide. Cure freshly dug sweet potatoes at 29-32°C with high humidity for 1 week to convert starches to sugars and heal any skin damage, then store in a cool (15°C), dry location.
1-5 kg per plant
Yield depends on variety, growing conditions, and management. These are typical results for well-maintained Australian raised beds.
Plant Planner checks every crop assignment against the full companion database, it knows that Sweet Potato grows well with Beans and Marigold and warns you about antagonists automatically.
Unlock Free4-6 plants is sufficient for a family of 4 for regular use; sweet potatoes store for 3-4 months
These estimates are based on average Australian household consumption. Adjust up if you plan to preserve, freeze, or use heavily; adjust down for occasional use.
Sweet Potato germinates in 14-21 days (slip development) and is ready to harvest in 90-130 days from slip planting. Harvest sweet potatoes 90-130 days after planting when the leaves begin to yellow or after a light frost kills the foliage.
Space sweet potato plants 30 cm apart, with 90 cm between rows. Correct spacing gives each plant room for airflow and root development and is one of the easiest ways to lift your yield in a raised bed.
Full sun (6+ hours daily). Low to moderate once established, very drought-tolerant.
It depends on your climate zone. In temperate areas (Sydney, Melbourne, Perth, Adelaide) plant sweet potato October-December. Other zones: tropical, Year-round; best September-December; subtropical, September-December; cool, October-November (challenging; short season); arid, September-November with irrigation.
Sweet Potato grows well alongside Beans, Marigold, Thyme, Oregano. Keep it away from Squash (space competition), Potato, which can compete with it or attract shared pests.
4-6 plants is sufficient for a family of 4 for regular use; sweet potatoes store for 3-4 months
Plant Planner automatically calculates how many sweet potato plants your family needs, assigns them to the right beds, and generates a personalised planting schedule for your climate zone.
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