Allium, Giant Ornamental Onion, Giant Allium 'Globemaster'


Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Cultivar: Globemaster
View this plant in a garden




Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Full Sun



Foliage Color:

Unknown - Tell us


36-48 in. (90-120 cm)


12-15 in. (30-38 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)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Where to Grow:

Unknown - Tell us



Bloom Color:

Medium Purple

Bloom Characteristics:

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

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer

Other details:

Unknown - Tell us

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:

Unknown - Tell us

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


This plant is said to grow outdoors in the following regions:

Sterling, Alaska


Sacramento, California

Denver, Colorado

Old Lyme, Connecticut

Stamford, Connecticut

Cordele, Georgia

Dallas, Georgia

Chicago, Illinois

Decatur, Illinois

Metamora, Illinois

Mount Prospect, Illinois

Britt, Iowa

Olathe, Kansas

Shawnee Mission, Kansas

Barbourville, Kentucky

Ewing, Kentucky

Taylorsville, Kentucky

Adamstown, Maryland

Baltimore, Maryland

Edgewater, Maryland

Brimfield, Massachusetts

Springfield, Massachusetts

Westborough, Massachusetts

Winchester, Massachusetts

Dearborn Heights, Michigan

Highland Park, Michigan

Forest Lake, Minnesota

Florence, Mississippi

Saint Louis, Missouri

Ponca, Nebraska

Concord, New Hampshire

Lisbon, New Hampshire

Neptune, New Jersey

Melrose, New Mexico

Albany, New York

Chester, New York

Kingston, New York

Pennellville, New York

Rochester, New York

Southold, New York

Elizabeth City, North Carolina

Akron, Ohio

Dayton, Ohio

Felicity, Ohio

Oak Hill, Ohio

Bellefonte, Pennsylvania

Norristown, Pennsylvania

State College, Pennsylvania

Wilkes Barre, Pennsylvania

Conway, South Carolina

Houston, Texas

Santa Fe, Texas

Salt Lake City, Utah

Tremonton, Utah

Newport News, Virginia

Kalama, Washington

Kent, Washington

Sequim, Washington

show all

Gardeners' Notes:


On Jun 20, 2017, Conan from Rochester, NY (Zone 6b) wrote:

These are truly GIANT and amazing.
Planted 4 huge beds of these last fall- allium in the back, crown imperials in the center and daffodils in the front.
People are constantly stopping to comment on them.
Alternated the Globemaster with the Ambasador varieties - Ambassador is a darker purple, slightly smaller, and blooms a couple weeks later. Blossoms on the Globemaster are easily 6" in diameter.
Some of the plants seem to have genetic mutations, as some have 4 stems per blossom, fused together- unusual, but not unslightly
Have purchased all my bulbs from A.D.R. Bulbs Inc. - wholesale.
The quality, size and price of their bulbs cannot be beat.
(They only sell wholesale)

I had put in approx. 150 of the slightly smaller var... read more


On Apr 26, 2017, saya from Heerlen,
Netherlands (Zone 8b) wrote:

Allium Globemaster is hybridized by J. R. Bijl van Duyvenbode, its registration was in 1971. A. 'Globemaster' came from a cross between A. macleanii and A. christophii. Received the Award of Garden Merit (AGM) by the Royal Horticultural Society (RHS).

Very much loved by the bees, It gives excellent cutflowers also.


On Jun 23, 2015, NHBabs from Concord, NH wrote:

This Allium hybrid is sterile, so there is no seeding around and the flowers are longer lasting than other large Alliums. It returns well here in central NH and I have had neighbors stop to ask what it is during bloom time. The color has a bit less pink tone than some others, and the flowers are extra large.


On Apr 30, 2012, CyndeeT from Maple Hill, NY (Zone 6b) wrote:

I will say this they are Magnificent in Upstate New York !
I do get many compliments on them (I did share, see photo) for the Gardener having the issue with them;
if she would have Beheaded the GLOBE
Before letting it go to seed
this would have NEVER been an issue.
I behead all my flowers to keep them blooming healthy
for years to come.


On Feb 20, 2012, gardengirl86 from Middleboro, MA wrote:

Many years ago I planted Giant Allium, and I have been cursing them ever since. They quickly took over my garden, and after about 30 years I am still trying to get rid of them. They quickly lost their giant size and reverted back to small onion-like plants that keep popping up everywhere. How about an article on how to keep them under control.
Their bulbs seem to grow like little strings of pearls and when you think you have the entire thing, the string breaks and you just know that there is still a piece of it in the ground. Will never grow them again. But that doesn't matter because I know I will never get rid of them anyway.


On May 17, 2010, runnerboy713 from Westborough, MA (Zone 5b) wrote:

A nice spring bulb. It provides some nice color after the daffodils have passed but before other perennials are beginning to bloom. The honey bees appreciate them too. They have a pleasant fragrance at close range. As another poster mentioned, hide them in the middle or back of a border because the foliage is unattractive and starts to brown, even as the flower is opening and in full bloom.


On Jun 29, 2009, carpathiangirl from Akron, OH (Zone 5a) wrote:

Easy-to-grow, undemanding and interesting plant here in my 5a zone.


On Apr 3, 2009, hk1972 from Henderson, NV wrote:

Globemasters do not grow in the hot, dry, desert region here. Those catalog companies will say anything to get you to buy! I am in zone 9a and have had no luck with these. Other alliums have done well. The most this can grow is about 6 leaves in mid-spring, a stick and bud comes out, then it gets too hot to bloom as the globemasters are known for their large spheres. I have never seen this grown successfully anywhere here in Henderson or Las Vegas, NV. But have seen it do very well in Southern California.


On Jan 4, 2009, lakeshoredrive from Chicago, IL wrote:

The Globemaster is just beautiful. Like a giant lollipop, not picky about soil, even tolerating salt.


On Sep 25, 2006, lorettamar from Southold, NY (Zone 7a) wrote:

These tall flowers don't have to be staked, but the leaves are unattractive. Be sure to plant them among other plants that have plenty of nice foliage.