Botanical name
Allium cepa
Family
Alliaceae
Spacing
Space 12-15 cm (5-6″) apart in rows that are 45-75 cm (18-30″) apart. Thin to 8 cm (3″) apart.
Depth
Plant seeds 6-12 mm (¼-½”) deep.
Requirements
Prefers a sunny site with fertile, well-drained but moist soil.
Germination
Seeds will sprout in 10-14 days.
Pests
Onion maggots, thrips
Timing
Start seeds indoors in February, for transplanting into the garden later in the spring; or sow directly outdoors from mid April.
Growing
Performs well planted in clusters of 4-5. Bend over any flower stalks that start to grow so the plant’s energy goes into building the bulb. Keep a clean garden; thrips live in weeds from previous years.
Harvest
115 days
Season
Cool, annual
