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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Category:

Bulbs

Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us

Height:

36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)

Spacing:

9-12 in. (22-30 cm)

Hardiness:

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

Danger:

N/A

Bloom Color:

Violet/Lavender

Purple

Bloom Time:

Late Spring/Early Summer

Mid Summer

Foliage:

Herbaceous

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Non-patented

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

Regional

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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Gardeners' Notes:

1
positive
2
neutrals
1
negative
RatingContent
Negative

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

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

Blooms in May in my garden. Nice accent plant.

Positive

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

Makes a great cut flower last a long time.

Neutral

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.