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August 1, 2026Short & citedBlog
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Field Notes • Plants

Leek

Leek is a cool-season biennial vegetable in the onion family, grown for its long, blanched edible stalk made from bundled leaf sheaths.

Updated August 1, 20261 min readCited sources

Leek is a cool-season biennial vegetable in the onion family, grown for its long, blanched edible stalk. It has a mild onion-like flavour and is widely used in soups and stews.

What it is

Leeks are members of the onion family with flat leaves and little bulb development. The edible part is the elongated white stalk formed from overlapping leaf bases, with green leaves also edible.

How it is grown

Leeks are cool-season, frost-tolerant plants usually grown as annuals. They require a long growing season and are often blanched by mounding soil around the base to exclude light. They are well-suited to Canadian gardens.

How it is used

Leeks have a mild, sweet onion flavour and are used in soups, stews, casseroles, pies, and other cooked dishes. They can also be eaten raw in salads.

In short

  • Leeks are related to onions but do not form a true bulb.
  • The edible portion is the blanched stalk and green leaves.
  • They are frost-tolerant and grown as annuals.
  • Common in European cooking, especially soups and stews.
Canadian angle

Leeks are widely available in Canadian grocery stores and home gardens, and Canadian horticulture sources describe them as a cool-season vegetable suitable for growing in local climates.[10][13]

Quick questions

What is a leek?
A leek is a vegetable in the onion family grown for its long, mild-flavoured edible stalk and leaves.
Is a leek a type of onion?
Yes. Leeks are closely related to onions and garlic, but unlike onions they do not form a true bulb.
How are leeks usually cooked?
Leeks are commonly cooked in soups, stews, casseroles, and pies, but they can also be eaten raw.

Sources

  1. University of Wisconsin–Madison Extensionhttps://hort.extension.wisc.edu/articles/leeks/
    Supports: Scientific name, plant structure, flavour, and origin.
  2. Encyclopaedia Britannicahttps://www.britannica.com/plant/leek
    Supports: Definition, family, origin, flavour, and culinary uses.
  3. CABI Compendiumhttps://www.cabidigitallibrary.org/doi/full/10.1079/cabicompendium.4248
    Supports: Cool-season habit, biennial nature, and global cultivation.
  4. University of Arkansas Division of Agriculturehttps://www.uaex.uada.edu/publications/pdf/FSA-6070.pdf
    Supports: Plant morphology, edible parts, and culinary uses.
  5. Washington State Department of Agriculturehttps://www.agr.wa.gov/departments/business-and-marketing-support/farm-to-school-toolkit/wa-grown-food-recipe-kit/foodtoolkit/items/vegetables/leeks/facts
    Supports: Edible portion, blanching, and nutritional notes.
  6. University of Minnesota Extensionhttps://www.extension.umn.edu/vegetables/growing-leeks
    Supports: Scientific name, growth habit, edible parts, and culinary uses.