fruit vegetable

Leek

The Story

Plant Bio

Allium porrum is an upright biennial geophyte grown as an annual vegetable, native to southwestern Asia and the Mediterranean. It produces a thick, non-bulbing cylindrical pseudostem of overlapping leaf sheaths topped by a fan of glaucous blue-green, linear leaves.

When allowed to bolt in its second year, the plant sends up a tall, solid scape bearing a dense, spherical umbel of white to pale pink flowers. The edible shanks require active soil mounding to remain tender, white, and mild in flavor.

Uses & Benefits:

Provides architectural interest in edible landscapes with its upright, fan-like glaucous foliage and tall summer flower scapes.

Produces a highly versatile, mild-flavored culinary stem that is exceptionally frost-hardy and harvestable through winter.

Flowers attract generalist native bees, honeybees, and beneficial hoverflies when plants are allowed to bolt.

Essentials

At a Glance

Plant Type

Fruit Vegetable

Height

48"

Width

12"

Light

Full Sun

Zones

4, 5, 6, 7, 8, 9

Water

High

Humidity

Moderate

Lifespan

Biennial (grown as annual)

Native To

Southwestern Asia, Mediterranean, Southern Europe

Toxicity

Toxic to Dogs & Cats

Bloom period

Summer

In flower about 3 months of the year

Planting

How to Grow

Sow seeds indoors in late winter or early spring, transplanting outdoors once seedlings reach pencil thickness.
Plant in deep furrows or individual holes six inches deep, leaving only the leaf tips exposed to naturally start the blanching process.
Maintain consistent soil moisture through regular irrigation, as the shallow root system does not tolerate drying out.
Hill soil or compost up around the stems as they grow to extend the length of the white, blanched shank.

Pro Tip

Mound soil or compost progressively around the stems multiple times during the growing season to blanch the lower shafts, ensuring they remain tender and white rather than tough and green.

Keep It Thriving

Care Guide

Do

Water regularly to keep the shallow root zone consistently moist.
Apply nitrogen-rich organic fertilizers during active vegetative growth.
Hill soil around the stems progressively to blanch the shafts.

Don't

Do not plant in heavy, unamended clay or poorly drained soils.
Do not prune the green leaves aggressively during the growing season.
Do not allow the soil to dry out completely during dry spells.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Harvest
Pest Check
Plant
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Kitchen GardenEdible LandscapingRaised Beds

Companion Plants

Daucus carota Brassica oleracea Lactuca sativa

Multiply

Propagation Methods

Good to Know

Common Questions

Leek questions

What zones can Leek grow in?

Leek is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

When does Leek bloom?

Leek typically blooms in summer through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Leek need full sun?

Leek does best in full sun (6+ hours).