lettuce (Cos) 'Corsair'

Grow in full sun on moisture-retentive soil. Sow a short row every fortnight to ensure continuity of cropping. Use cloches, plastic tunnels or horticultural fleece to protect early and late crops. See the RHS A-Z Guides to vegetable cultivation for more detailed advice

No pruning required

Propagate by seed sown in situ, from March to August depending on climate

May be susceptible to slugs and snails

May be susceptible to grey moulds and downy mildews