Leek, a biennial plant of the Mediterranean region, widely grown for food. The leek is related to the onion and garlic. It has a mild, distinctive flavor, suggestive of garlic. Leeks are prepared similarly to asparagus and are eaten in soups, stews, and other dishes. The national emblem of Wales, the leek is worn by Welshmen on St. David's Day, March 1.
The leek, unlike the onion, does not form a bulb, though the bases of its swordlike leaves are slightly thickened. The flower stalk is 4 to 12 inches (10 to 30 cm) high and the leaves 5 to 9 inches (13 to 23 cm) long. The plant is grown from seed, as an annual. Soil is banked about the plants as they grow, to blanch the lower parts.
The leek is Allium porrum of the lily family, Lilaceae.The leek is a variety of onion but has a mild, distinctive flavor suggestive of garlic.