Allium cepa var. cepa
Space 12-15 cm (5-6″) apart in rows that are 45-75 cm (18-30″) apart. Thin to 8 cm (3″) apart.
Plant seeds 6-12 mm (¼-½”) deep.
Prefers a sunny site with fertile, well-drained but moist soil.
Seeds will sprout in 10-14 days.
Onion maggots, thrips
Plant in the spring if given a really early start indoors (but then bulbs are not as mild or large), or in August to overwinter (best choice).
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.
Matures in 300 days fall sown, in 150 days, spring sown