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Sprout Authority
Leek growing in a garden
Annual vegetable

Leek plant profile

Allium porrum

An annual vegetable for full sun.

Last updated .

When to plant

When to plant Leek

Leeks are a hardy cool-season crop. Sow seed in late winter or early spring, then transplant the young plants out in spring after about 6 to 8 weeks of growth (USU).

The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.

Open Leek in my garden calendar

Shows the source-backed planting season, not frost-adjusted dates.

Growing conditions

Sun
Full sun
Planting depth
0.25 in
Lifecycle
Annual
Spacing
4 to 6 in apart, rows 8 in
Days to maturity
100 to 120 days (from sowing)

Common problems

Watch for these

Evidence trail

Evidence behind this profile

Original extension and institutional publications behind the planting, care, and safety facts on this page.

  1. How to Grow Leeks in Your Garden

    Utah State University Extension. Supports general reference. Checked 2026-06-11.

  2. Toxic and Non-Toxic Plants: Leek (Allium ampeloprasum) entry

    ASPCA Animal Poison Control Center. Supports pet-safety verdicts for dogs and cats. Checked 2026-07-18.