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Hardiness: 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)
On Feb 11, 2013, kydrummer from Silver Spring, MD wrote:
I have been growing buddleja davidii in Maryland for 20 years and have never had a volunteer seedling. Japanese barberry is very invasive in the woods here though, and porcelain berry vine is a nightmare.
On Jul 28, 2011, Patmisty1 from College Park, MD wrote:
This plant is beautiful but needs to be deadheaded and not allowed to go to seed. It is invasive in many states and crowds out native species. Maryland is one of the states that has it listed as invasive and to be removed from the wild. Please check with your extension service to see if it is a problem in your state.
On Jun 12, 2010, crablegs from Vienna, ME (Zone 5a) wrote:
I grew Buddleia davidii [not sure which one] several years ago, about 1995-2004 in California, Maryland. It grew well with little attention. Recommendations at that time were to cut it back in late March, early April. Sometimes that didn't happen, but it surely did attract butterflies and bees, regardless. I say it grew until 2004. It might be growing still. That is when I moved to Maine.
Today I found the plant again.
While the hang tag says to zone 5, I'm going to try it in zone 4.
Hopefully, I will remember to report back to you next year on my Maine experience with Buddleia davidii "Royal Red."
On Nov 25, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:
This variety is a 1928 hybrid from Good and Reese Nursery in Ohio. It's really not "red", but more of a deep scarlet or bright violet.
Most butterfly bushes are hardy in zones 5 - 9. If you live in zone 5 or a colder zone, the tops in your butterfly bushes will likely die back over the winter. Even so, they will come back the next growing season bigger and better then before. Butterfly bushes prefer full sun (they must receive eight or more hours of sun a day to thrive).
This plant has been said to grow in the following regions:
Bessemer, Alabama Chico, California Sacramento, California San Clemente, California San Jose, California Gainesville, Florida Kissimmee, Florida Palm Coast, Florida Dacula, Georgia Rincon, Georgia Keomah Village, Iowa Eastborough, Kansas Kingman, Kansas Hebron, Kentucky Berwyn Heights, Maryland California, Maryland Kemp Mill, Maryland Dearborn Heights, Michigan Mount Clemens, Michigan Royal Oak, Michigan East Gull Lake, Minnesota Candia, New Hampshire Clinton Corners, New York Raleigh, North Carolina Glouster, Ohio Xenia, Ohio Oklahoma City, Oklahoma Albany, Oregon Beaver Falls, Pennsylvania East Norriton, Pennsylvania Glenshaw, Pennsylvania Waterford, Pennsylvania Lincolnville, South Carolina North Augusta, South Carolina Knoxville, Tennessee Middleton, Tennessee Everman, Texas Hudson Bend, Texas Irving, Texas San Antonio, Texas (2 reports) Olympia, Washington Seattle, Washington Black Earth, Wisconsin Marinette, Wisconsin