Onion Growing Guide
Allium cepa
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 can be given a liquid feed in spring.
Spacing
Single Plants: 15cm (5") each way (minimum)
Rows: 10cm (3") with 20cm (7") row gap (minimum)
Sow and Plant
Sow seeds in early autumn to plant out in late autumn
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.
Notes
Onions will only start bulbing when the days become long enough to expose them to enough light
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.
Planting and Harvesting Calendar
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Plant Diseases which Affect Onion