It is sown in nursery; either in rows or dibble seeding as soon as January up to April, then transplanted outdoors 3 months after. It is sown outdoors in June. Harvesting takes place almost all year round according to the variety.
As with many vegetables, leek can be attacked by pests such as the leek leafminer (an insect that comes and eats the leaves) or diseases including leek rust (appearance of red spots on the leaves caused by a fungus) or mildew leek (a fungus that grows under high heat and high humidity of the soil). Subsequently these diseases cause a slower growth of the plant, which can even lead to the death of the latter. Leek is a vegetable but also a leaf.