tree onion

Grow in fertile, moisture retentive, but well-drained soil in full sun. Consider liming if the soil is acid, pH below 6.5. Harvest as spring onions in spring or let to gow into shallot-size onions. Prone spreading if bulbils not removed

Remove bulbils from the top of the flower stem for culinary porposes and to reduce spread around the garden. Prune back once the folaige have died down

Propagate by planting sets of bulbils in the autumn or in spring

May be susceptible to onion fly, leek moth and narcissus eelworm

May be susceptible to onion white rot, onion downy mildew, leek rust and onion neck rot. Bolting, producing flowers, may be a problem