Photo by Melody

PlantFiles: Blue Globe Onion, Blue Flowered Garlic, Azure Flowered Garlic
Allium caeruleum

Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Species: caeruleum (see-ROO-lee-um) (Info)

Synonym:Allium azureum

5 vendors have this plant for sale.

34 members have or want this plant for trade.


6-12 in. (15-30 cm)
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

6-9 in. (15-22 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:
Medium Blue

Bloom Time:
Late Spring/Early Summer


Other details:
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
This plant is resistant to deer
Flowers are good for drying and preserving

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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1 positive
No neutrals
1 negative

Gardeners' Notes:

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

I've had this grow in seashore sandy soil on Cape Cod. The blue is sky-blue, but the flowers are small. A good plant for a rock garden, perhaps, where it can be examined closely, but in a border or landscape context it's too small to make an impact.

Negative anelson77 On May 25, 2009, anelson77 from Seattle, WA wrote:

I've tried fall planting this twice and it hasn't shown up for me


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

Denver, Colorado
East Haddam, Connecticut
Divernon, Illinois
Mount Prospect, Illinois
Winnetka, Illinois
Hebron, Kentucky
Hyannis, Massachusetts
Adrian, Michigan
Owosso, Michigan
Pinconning, Michigan
South Lyon, Michigan
Lincoln, Nebraska
Binghamton, New York
Dayton, Ohio
Oklahoma City, Oklahoma
Grants Pass, Oregon
Brookhaven, Pennsylvania
Salt Lake City, Utah (2 reports)
Leesburg, Virginia
Kalama, Washington
Seattle, Washington
Vancouver, Washington
Belleville, Wisconsin
Ellsworth, Wisconsin
Kinnear, Wyoming
Riverton, Wyoming

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