Onion (Autumn planted) Growing Guide
Crop Rotation Group
Allium (Onion family) ●
Soil
Fertile, well drained soil with compost dug in. In clay soil, grow in raised beds or rows.
Position
Sun or partial shade.
Frost tolerant
Yes.
Feeding
Not normally required, though overwintered plants can be given a liquid feed in spring.
Companions
Beetroot, Carrot, Swiss Chard, Cabbage and Lettuce.
Spacing
Single Plants: 15cm (5") each way (minimum)
Rows: 15cm (5") with 25cm (9") row gap (minimum)
Sow and Plant
Sow seed in pots (under cover in frost areas) in late winter before planting out mid-late spring.
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.
Notes
Japanese variety onion sets can be used to give an early harvest. Onion sets are also the better choice for heavier or wetter soils.
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.
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.
Planting and Harvesting Calendar
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Pests which Affect Onion (Autumn planted)
Plant Diseases which Affect Onion (Autumn planted)
