Step 1: Plant in Trays
In spring, sow seed thinly, about ½in (1cm) deep, in a tray on a windowsill indoors. Water the tray well and do not allow it to dry out. When the seedlings are approaching 8in (20cm) tall harden them off.
Step 2: Trim Roots
Once the leeks are hardened off, fill a large container with multipurpose compost. Gently ease each leek from the seed tray using a dibber or pencil, and trim any long straggly roots with scissors to make transplanting easier.
Step 3: Transplant Leek Seedlings
Make holes 6in (15cm) deep and drop a leek into each. Space plants 4–8in (10–20cm) apart; a wider spacing should result in larger leeks. Pour water into each hole and the compost will slowly fill around the stem to blanch it.
Step 4: Add Soil Around Growing Leeks
Make sure the compost is kept moist and apply a liquid feed every few weeks. Add extra compost around the plants as they grow to produce long, white, blanched stems. Harvest when the leeks are large enough.
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Known for their onion-like punch, leeks are a delicious addition to savory, homemade dishes.