Make successive sowings, February, March, April in open on deeply dug, well-manured ground. Water the ground a day before.
Do notthickly, nor cover with much soil; water well and thin ous when about 3 in. high. Transplant into rows 1 ft. apart, the seedlingt being spaced at 9 in.
The blanching can be done by Nature if the young plants are dropped into holes about 10 in. deep and made with a dibber, these holes not being filled, but only enough soil thrown in to cover the, and then the hole filled with water. Do not allow to go dry or caked, using a hoe for this. The holes will eventually fill up as the result of hoeing plus rain.
Earthing up in early August also helps blanching. This method (known as growing on the flat) may not be advisable in very wet districts.
Leeks can also be planted in trenches like celery. Trenches should be 15 in. wide, 2 ft. apart and plants spaced at 9 in.
For an early crop sowin boxes early in February on a moderate heat for an early crop. Prick out when about 2 in. high, transfer to a cold frame in April, and harden off and plant out in May. They can be lifted as required for use.
Good varieties include Dobbie’s Champion, Musselburgh and Walton Mammoth.