Allium, Giant Ornamental Onion, Giant Allium 'Globemaster'
Allium

Category:
Bulbs
Perennials
Water Requirements:
Average Water Needs; Water regularly; do not overwater
Sun Exposure:
Full Sun
Foliage:
Herbaceous
Foliage Color:
Height:
36-48 in. (90-120 cm)
Spacing:
12-15 in. (30-38 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)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
Where to Grow:
Danger:
N/A
Bloom Color:
Medium Purple
Bloom Characteristics:
This plant is attractive to bees, butterflies and/or birds
Bloom Size:
Bloom Time:
Late Spring/Early Summer
Mid Summer
Other details:
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
Regional
This plant is said to grow outdoors in the following regions:
Sterling, Alaska
GARBERVILLE, California
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 allGardeners' Notes:
Rating | Content |
---|---|
Positive | On Jun 20, 2017, Conan from Rochester, NY (Zone 6b) wrote: These are truly GIANT and amazing. |
Positive | On Apr 26, 2017, saya from Heerlen, 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). |
Positive | 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. |
Positive | On Apr 30, 2012, CyndeeT from Maple Hill, NY (Zone 6b) wrote: I will say this they are Magnificent in Upstate New York ! |
Negative | 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. |
Positive | 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. |
Positive | On Jun 29, 2009, carpathiangirl from Akron, OH (Zone 5a) wrote: Easy-to-grow, undemanding and interesting plant here in my 5a zone. |
Neutral | 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. |
Positive | 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. |
Positive | 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. |