Onion (Autumn planted) Growing Guide

Allium cepa

Onion (Autumn planted)

Crop Rotation Group

Allium (Onion family) 


Fertile, well drained soil with compost dug in. In clay soil, grow in raised beds or rows.


Sun or partial shade.

Frost tolerant



Not normally required.


Single Plants: 15cm (5") each way (minimum)
Rows: 15cm (5") with 25cm (9") row gap (minimum)

Sow and Plant

Onions can be grown from seed in which case start in pots under cover in late summer before planting out autumn to winter.
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.


Japanese variety onion sets can be used to give an early harvest. Onion sets are also the better choice for heavier or wetter soils.


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.


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)