Photo by Melody

PlantFiles: Giant Onion, Giant Allium
Allium giganteum

Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Species: giganteum (jy-GAN-tee-um) (Info)

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34 members have or want this plant for trade.

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36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

9-12 in. (22-30 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun


Bloom Color:

Bloom Time:
Late Spring/Early Summer
Mid Summer


Other details:
Average Water Needs; Water regularly; do not overwater
This plant is attractive to bees, butterflies and/or birds

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

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There are a total of 9 photos.
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1 positive
2 neutrals
1 negative

Gardeners' Notes:

Negative coriaceous On Feb 20, 2014, coriaceous from ROSLINDALE, MA wrote:

It's beautiful and dramatic in its first spring.

However, it rarely perennializes here (Boston Z6a). If you expect to throw it away after one season, like a tulip, you won't be disappointed by its performance. It needs a dry rest in summer and usually rots in an irrigated bed.

Neutral Gabrielle On Jul 3, 2011, Gabrielle from (Zone 5a) wrote:

Blooms in May in my garden. Nice accent plant.

Positive rh3708 On Dec 1, 2004, rh3708 from Westmoreland, TN (Zone 7a) wrote:

Makes a great cut flower last a long time.

Neutral smiln32 On Nov 12, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Huge globe-shaped flowers. There is a white version of this also - named "Alba". Prefers full sun.


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

Phoenix, Arizona
Sacramento, California
Mount Prospect, Illinois
Washington, Illinois
Springfield, Massachusetts
Sandusky, Michigan
Faribault, Minnesota
Marietta, Mississippi
Republic, Pennsylvania
Wilkes Barre, Pennsylvania
Pawtucket, Rhode Island
Knoxville, Tennessee
Fate, Texas
Midland, Texas
Kalama, Washington
Kirkland, Washington
Marysville, Washington
Vienna, Wisconsin
Sundance, Wyoming

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