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

Sow and Plant

Sow in pots under cover in early to mid spring. Plant out when the soil is warm. Alternatively, sow directly into weed-free ground in late spring.
Our Garden Planner can produce a personalised 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 areas where nights remain cool through summer.


Can be left in the ground until required and harvested right through autumn, winter and early spring.

Planting and Harvesting Calendar

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Pests which Affect Leek

Plant Diseases which Affect Leek