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…
It commonly naturalizes and can sometimes become a nuisance.
By seed or division of the plants after they have flowered.
Pests, diseases or disorders
Prone to white rot, downy mildew, eelworm, rust and onion fly.