Choose a sunny location with well-drained soil
Loosen the soil to a depth of 8 to 12 inches
Mix in compost or well-rotted manure
Test soil pH and aim for 6.0 to 7.0
Plant onion sets, seedlings, or seeds
Set transplants 1 to 2 inches deep
Space plants 4 to 6 inches apart
Space rows 12 to 18 inches apart
Plant seeds about 1/4 inch deep
Keep the pointed end of onion sets facing up
Water after planting
Keep soil evenly moist
Remove weeds regularly
Apply mulch to retain moisture and suppress weeds
Feed with a nitrogen-rich fertilizer if needed
Harvest when tops begin to fall over and dry
Cure harvested onions in a dry, airy place