Most leeks mature 100 to 120 days after sowing the seeds, but a few varieties mature in as few as 60 days. Begin the harvest when the stalks are about an inch (2.5 cm.) across. Depending upon your climate, you could be harvesting leek plants from late summer until early spring.

How long can you leave leeks in the ground?

Leeks can remain in the ground through the winter until they are needed.

What month do you harvest leeks?

Leeks can be harvested from late summer to early spring depending upon the variety and climate. In milder winter climates, leeks can be overwintered in the garden for spring harvest. Some varieties such as 'Winter Giant' and 'Tadorna Blue' are bred for overwintering.