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 organic matter
Test soil pH and aim for 6.0 to 7.0
Plant red onion sets, transplants, or seeds
Set onion sets 1 inch deep with the pointed end up
Space sets or transplants 4 to 6 inches apart
Space rows 12 to 18 inches apart
Plant seeds 1/4 inch deep
Keep soil evenly moist after planting
Remove weeds regularly
Apply a light mulch to conserve moisture
Fertilize with a balanced or nitrogen-rich fertilizer as needed
Thin seedlings if planted from seed
Avoid burying the bulb too deeply
Stop watering when tops begin to fall over
Harvest when tops yellow and flop over
Cure harvested onions in a dry, airy place