When to plant or sow Leek?

Leeks thrive in full sun and prefer rich, moisture-retentive soil. They do best in loam or clay soil that has been well prepared with plenty of organic matter. Before planting, dig over the bed thoroughly and incorporate well-rotted compost or manure to a depth of at least 20 cm. Leeks are heavy feeders and benefit from fertile ground. You can sow leek seeds indoors from late February or directly outdoors from March through May. For transplanting, sow seeds thinly in modules or seed trays and grow on until the seedlings are pencil-thick, usually 10–12 weeks after sowing. Transplant young leeks from April to early June when they're about 15–20 cm tall. The traditional method is to use a dibber to make holes 15 cm deep and 15 cm apart in rows 30 cm apart. Drop one leek seedling into each hole so that only the top leaves show, but don't backfill the hole with soil. Instead, simply water in well—the soil will gradually wash in around the roots. This deep planting encourages a long white shaft, which is the edible blanched stem you're aiming for. Alternatively, plant leeks in shallow trenches 10–15 cm deep, setting them at 15 cm intervals. As the leeks grow, gradually earth up soil around the stems every few weeks to increase the length of the white portion. Water thoroughly after planting and keep the soil consistently moist during the first few weeks while the young plants establish. A mulch of compost around the base helps retain moisture and suppress weeds.