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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)
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 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.
Regional...
This plant has been said to grow in the following regions:
, Garberville, California Sacramento, California Denver, Colorado Old Lyme, Connecticut Cordele, Georgia Dallas, Georgia Chicago, Illinois Decatur, Illinois Mount Prospect, Illinois Olathe, Kansas Shawnee Mission, Kansas Ewing, Kentucky Taylorsville, Kentucky Adamstown, Maryland Baltimore, Maryland Edgewater, Maryland Brimfield, Massachusetts Springfield, Massachusetts Winchester, Massachusetts Highland Park, Michigan Florence, Mississippi Ponca, Nebraska Lisbon, New Hampshire Neptune, New Jersey Melrose, New Mexico Albany, New York Chester, New York Pennellville, New York Southold, New York Elizabeth City, North Carolina Winston Salem, North Carolina Akron, Ohio Dayton, Ohio Felicity, Ohio Oak Hill, Ohio Bellefonte, Pennsylvania Norristown, Pennsylvania Wilkes Barre, Pennsylvania Conway, South Carolina Salt Lake City, Utah Tremonton, Utah Newport News, Virginia Kalama, Washington Kent, Washington