Onion Growing Guide

Onion

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.

Companions

Beetroot, Tomato, Lettuce, Chamomile and Flax. Jane recommends Beetroot, Lettuce, Cabbage, Strawberry.

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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