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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 May 27, 2009, karenathurston from Philadelphia, PA wrote:
I live in Philadelphia, PA (zone 6a) and planted a 'Longwood Blue' 2 years ago. It flowered the first year but there were no flowers at all last year. The foliage is also not as dense as the majority of photographs I have come across. I have it in morning shade/ afternoon sun in a fairly dry area that I substitute water during the hotter summer months. I'm going to try fertilizing it this summer to see if that helps it improve - it's looking kind of scraggly.
On Apr 19, 2008, ILUVTX from Fort Worth, TX wrote:
Here in Zone8a this plant grows great! It is very beautiful when it blooms in the summer and fall. All our neighbors comment how pretty it is! It is very tolerant of our Texas heat, humidity, and lack of rain in the warm months and does very well over the cooler winter months. I would recommend this plant to other gardeners in a similar climate.
On Oct 17, 2006, gardenworksva from Ruckersville, VA wrote:
Planted Dark Knight Spring '06 and having problems with the stems 'laying down' as well has becoming week and splitting off. Possibly it needs harder pruning early on. ?
On May 30, 2005, Julia_T from Northern, VA (Zone 7a) wrote:
I planted three in partial sun in zone 7a last spring. They flowered luxuriantly the same year -- put on a real show, plus the flowers have a delicious scent. The bumblebees agreed, but we didn't get any wasps. Ours have sapphire-blue flowers and soft gray-green foliage, on a mini tree-form habit. I've heard that they can spread quite a bit, so will update if that happens.
On Aug 25, 2004, digwell from Shelburne, NS (Zone 6a) wrote:
Have just purchased caryopteris Dark Knight, and put it in a bed next to Pee Gee hydrangea. The combination of the Dark Knight blue flowers against the white of the hydrangea is a lovely fresh change from the usual reds and yellows of most late summer flowers.
On May 13, 2004, MotherNature4 from Bartow, FL (Zone 9a) wrote:
I just purchased Bluebeard 'Dark Knight' yesterday. Being a native Floridian, this was the first time I've ever heard of this lovely plant, so if anyone else from Florida has any growing suggestions, I'd appreciate any and all input. MotherNature4
On Jan 3, 2003, lupinelover from Grove City, OH (Zone 6a) wrote:
Although it is supposed to be hardy to zone 4, this plant is not reliably hardy for me, possibly because of too much moisture in the winter dormant season. The flowers are welcome in the late summer and autumn, but I must replace it every 2-3 years.
Regional...
This plant has been said to grow in the following regions:
El Mirage, Arizona Oakland, California Temecula, California Denver, Colorado Bartow, Florida Nampa, Idaho Floyds Knobs, Indiana Iowa City, Iowa Hebron, Kentucky Monroe, Louisiana Alfred, Maine Sandwich, Massachusetts Dearborn Heights, Michigan Pinconning, Michigan Lincoln, Nebraska Millington, New Jersey Whiting, New Jersey Albuquerque, New Mexico Poughkeepsie, New York Williamsburg, Ohio Chiloquin, Oregon Philadelphia, Pennsylvania Barrington, Rhode Island Austin, Texas Canyon Lake, Texas Fort Worth, Texas Killeen, Texas Farmington, Utah Kaysville, Utah Ruckersville, Virginia Issaquah, Washington Marysville, Washington North Bend, Washington Seattle, Washington Vancouver, Washington
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