Photo by Melody

PlantFiles: Leek
Allium porrum 'Large American Flag'

Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Species: porrum (POH-rum) (Info)
Cultivar: Large American Flag
Additional cultivar information: (aka Broad London, American Flag)

Synonym:Allium ampeloprasum var. porrum

» View all varieties of Onions and Garlic

4 vendors have this plant for sale.

8 members have or want this plant for trade.


18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

6-9 in. (15-22 cm)

Not Applicable

Sun Exposure:
Full Sun


Bloom Color:

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Grown for foliage

Other details:
Unknown - Tell us

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; sow indoors before last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive suzy_qu3 On Jan 17, 2011, suzy_qu3 from East Chatham, NY wrote:

Very tolerant of poor conditions. Produced a nice flavored, tall leek, but not too thick.

Positive CurtisJones On Sep 8, 2008, CurtisJones from Longmont, CO wrote:

From your friends at Botanical Interests: Europeans have savored the delicious flavor of leeks for centuries, but they are gaining popularity with gourmets and cooks in the U.S. This onion relative has compact stems that thicken, but do not form bulbs like onions. The appealing white stems have a creamy yellow heart with a subtle onion flavor. They are superb eaten fresh, grilled, sauteed, and added to soups or stews. With a long crop time of 120 days (to get the largest stems), this is a great vegetable to start indoors early in spring when you are anxious to get back to gardening. Leeks are cold tolerant and can be left in the garden into fall for an extended harvest.


This plant has been said to grow in the following regions:

Peel, Arkansas
Los Angeles, California
Sunol, California
Longmont, Colorado
Bingham Lake, Minnesota
Albuquerque, New Mexico
East Chatham, New York
Fort Worth, Texas
Huntington, West Virginia

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