leek 'Lancaster'

Grow in moist but well-drained soil that is rich in organic matter, preferably in full sun though they will tolerate partial shade. For longer blanched stems, draw up soil around the stems in late summer and early autumn. See the RHS A-Z guides to vegetable cultivation for more detailed advice

No pruning required

Propagate by seed sown outside in spring

May be susceptible to slugs and snails, leek moth, onion fly, and onion thrips

May be susceptible to leek rust, onion white rot, downy mildews, foot and root rots, fungal leaf spots, and smuts