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)

2 vendors have this plant for sale.

33 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
Laflin, Pennsylvania
Republic, Pennsylvania
Pawtucket, Rhode Island
Knoxville, Tennessee
Fate, Texas
Midland, Texas
Inglewood-finn Hill, Washington
Kalama, Washington
Marysville, Washington
Vienna, Wisconsin
Sundance, Wyoming

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