I was on some allotments at the weekend and was struck how bare and scruffy they look at this time of year. We've passed the Spring equinox, but seedlings…
Harvesting may start in late summer.
Propagation is by offsets, by seed in autumn or by division of clumps (spring flowering varieties in late summer and summer flowering varieties in spring).
Pests, diseases or disorders
Onion flies and onion eelworms.