Leek Growing Guide

Allium porrum


Crop Rotation Group

Allium (Onion family) 


Requires rich, loamy soil that holds moisture well.


Sun or partial shade.

Frost tolerant



In late summer while the weather is still warm, drench plants thoroughly with a water-soluble plant food.


Single Plants: 7" (20cm) each way (minimum)
Rows: 5" (15cm) with 11" (30cm) row gap (minimum)

Sow and Plant

Sow indoors in early spring, and move to a protected cold frame if you have one. Transplant when seedlings are about the size of a pencil.
Our Garden Planner can produce a personalized calendar of when to sow, plant and harvest for your area.


When leeks are almost the size you prefer, blanch them for 2 to 3 weeks by putting a mound of soil, mulch, or a cardboard tube around the base of each stem. Grows best in climates where nights remain cool through summer. In mild winter climates, try leeks as a fall-to-spring crop.


Dig as needed in the kitchen. In cold winter climates, dig plants before the ground freezes in early winter.


Struggling plants may be infested with onion root maggots, which are easy to see when you dig up a plant. Promptly remove affected plants.

Planting and Harvesting Calendar

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Pests which Affect Leek

Plant Diseases which Affect Leek