Crop Rotation Group
Allium (Onion family)
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Soil
Any average, well drained soil.
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Position
Full sun to partial afternoon shade.
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Frost tolerant
Many varieties are cold hardy to -10F (- 33C) when well rooted in the garden.
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Feeding
Work an organic fertilizer into the soil prior to setting out seedlings or sets.
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Companions
Often planted with mound-forming herbs.
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Spacing
Single Plants: 3" (10cm) each way (minimum)
Rows: 3" (10cm) with 3" (10cm) row gap (minimum)
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Sow and Plant
Start seeds indoors in late winter to early spring when growing cold-hardy bunching varieties. Or, plant large sets close together and harvest the plants when young.
Our Garden Planning Tool can produce a personalized calendar of when to sow, plant and harvest for your area.
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Notes
Any immature onion can be eaten as a green onion, or scallion.
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Harvesting
Pull individual plants as you need them in the kitchen. With perennial bunching varieties, lift clumps in spring or fall and replant some of the divisions.
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Troubleshooting
Slugs often chew holes in onion leaves in wet weather.
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