Onion (Autumn planted) Growing Guide Allium cepa Crop Rotation Group Allium (Onion family) ● Soil Fertile, well-drained soil enriched with compost. Position Sun or partial shade. Frost tolerant Yes. Feeding Not normally required. Spacing Single Plants: 15cm (5") each way (minimum) Rows: 15cm (5") with 25cm (9") row gap (minimum) Sow and Plant Start seeds in pots under cover in late summer before planting out in autumn, or grow from purchased sets (immature bulbs) planted in autumn. Our Garden Planner can produce a personalized 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. Not recommended in the tropics. 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 < Back to All Plants Pests which Affect Onion (Autumn planted) Allium Leaf Miner Aphids (General) Millipede Onion Root Fly Slug Snail Plant Diseases which Affect Onion (Autumn planted) Allium White Rot Onion Downy Mildew Onion Fusarium Basal Rot
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