Leeks are a cool-season biennial that often overwinters to provide a second harvest the following year. Unlike other vegetables, leeks prefer constantly moist soil.  For more information about growing leeks, click here.

VARIETIES:  Large American Flag and King Richard are good choices.




Soil Preparation: Before planting, incorporate organic matter and all-purpose fertilizer. For more information on soil preparation, click here.



  • Leeks can be grown from seed or transplants.
  • In late March, seeds should be planted ¼ inch deep, in rows 8-16 inches apart. Thin plants 4-6 inches apart after sprouting.
  • Transplants may be planted in April, at the same distance as thinned leeks.


Irrigation: Leeks require regular watering. Water levels kept at field capacity are ideal. For more information on watering, click here.


Fertilization: Apply a nitrogen-based fertilizer in late May and June. For more information on fertilizing, click here


Harvest: Leeks are ready to pick when stalks are 1 inch in diameter.


COMMON PESTS AND DISEASES:  Thrips, onion maggot and wireworm are common pests of leeks. For more information on controlling pests and diseases, click here.