Select a sunny site with well-drained, fertile soil
Test soil pH and aim for slightly acidic to neutral soil
Prepare the land by removing weeds and loosening the soil
Mix in well-rotted compost or manure before planting
Choose healthy onion seeds, sets, or transplants
Sow seeds or plant sets/transplants at the correct spacing
Plant shallowly, with the tops just above the soil surface
Water regularly to keep soil evenly moist
Avoid overwatering and waterlogging
Apply mulch to conserve moisture and suppress weeds
Weed the bed frequently to reduce competition
Thin seedlings if they are overcrowded
Feed with a balanced fertilizer during early growth
Reduce nitrogen later to encourage bulb formation
Monitor for pests and diseases
Rotate crops to prevent soil-borne problems
Harvest when tops fall over and begin to dry
Cure bulbs in a dry, airy place before storage
Store cured onions in a cool, dry, well-ventilated area