Crop Rotation Group
Allium (Onion family)
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Soil
Fertile, well drained soil with compost dug in. In clay soil, grow in raised beds or rows.
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Position
Sun or partial shade.
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Frost tolerant
Yes.
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Feeding
Not normally required.
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Companions
-
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Spacing
Single Plants: 15cm (5") each way (minimum)
Rows: 10cm (3") with 20cm (7") row gap (minimum)
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Sow and Plant
Onions can be grown from seed in which case start in pots under cover in late winter before planting out in spring.
Our Garden Planning Tool can produce a personalised calendar of when to sow, plant and harvest for your area.
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Notes
Japanese variety onion sets can be used to give an early harvest.
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Harvesting
Harvest as soon as they reach a reasonable size. If storing them, wait until the tops start to die down and dry for about 10 days. Not recommended in the tropics.
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Troubleshooting
Weed early and often to keep onions growing strong. Seedlings are less likely to bolt (produce flowers) compared to bulb onions grown from sets.
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