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Family: Saxifragaceae (saks-ih-frag-AY-see-ee) (Info) Genus: Heuchera (HEW-ker-a) (Info) Cultivar: Obsidian Additional cultivar information: (PP14836) Hybridized by Heims; Year of Registration or Introduction: 2003
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) USDA Zone 10a: to -1.1 °C (30 °F) USDA Zone 10b: to 1.7 °C (35 °F) USDA Zone 11: above 4.5 °C (40 °F)
On Jul 29, 2005, franbo from Waterloo Canada wrote:
My three plants are in their second year. They have done well despite dry summers and cold (-30) winters in Ontario. This year the leaves are glossy purple-black and look stunning next to the Japanese Golden Grass (Hakonechloa macra Aureola)
On Jun 30, 2005, keno from Ottawa, ON (Zone 4a) wrote:
It has survived a tough Ottawa (Canada's capital) winter, i.e. zone 4a. It thrives again this spring. The foliage has a bit of green this year; possibly due to location not shady enough.
Despite its dark colour, it looks outstanding among other green perennials.
On Nov 23, 2004, esw from Haydenville, MA (Zone 5a) wrote:
Started out in my garden in a mostly sunny area and didn't like it. When moved to a morning, early afternoon sun and afternoon shade it perked up and is thriving. Deep dark unmarked foliage, somwhat shiny. Very striking planted near Heuchera 'Amber Waves' for contrast. Hardiness yet to be determined in my zone 5 garden...
On Oct 16, 2004, Kruch72 from Elgin, IL (Zone 5a) wrote:
Very nice foilage.
Regional...
This plant has been said to grow in the following regions:
Kenai, Alaska Denver, Colorado Old Lyme, Connecticut Waterbury, Connecticut Cordele, Georgia Chicago, Illinois Mount Prospect, Illinois Plainfield, Illinois Haydenville, Massachusetts Plainwell, Michigan Silver Lake, Minnesota Cape May Court House, New Jersey Averill Park, New York Southold, New York Boone, North Carolina Pekin, North Dakota Cincinnati, Ohio Coshocton, Ohio Ravenna, Ohio Enid, Oklahoma Portland, Oregon Norristown, Pennsylvania Conway, South Carolina Montpelier, Vermont Kalama, Washington Kirkland, Washington Vancouver, Washington
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