When to plant Leeks in Cambridge

Around 23rd March - 7th April, dig the bed well and work in compost. Leeks do best in moisture-retentive but free-draining soil, and a loose, stone-free tilth helps the stems grow straight.

Sow seeds thinly in modules or a seed tray around 21st February - 23rd March, about 1 cm deep. Keep them at 15–18 °C and water gently so the compost stays moist but not sodden.

Move seedlings on when they are large enough to handle, from 14th March. Pot them into small modules or deeper trays so the roots can develop without crowding.

Set plants outside for a few hours a day before planting out. Do this over 23rd April - 7th May so they adjust to wind, sun and cooler nights without checking growth.

Plant sturdy seedlings into deep dibbed holes around 23rd April - 6th June, leaving just the base of the leaves at soil level. Water in thoroughly at once, then let the soil settle naturally around the roots rather than firming hard.

Keep the rows weed-free and draw soil up around the stems as they thicken. Start from 23rd April and repeat as the plants grow, keeping moisture steady in dry spells so the stems stay tender and pale.

Lift leeks from 27th September once the stems are a usable size, then keep picking through 16th February 2028. Loosen the soil with a fork before pulling and take only the stems needed.