Photo by Melody

PlantFiles: Coral Bells, Alumroot, Coralbells, Alum Root
Heuchera 'Obsidian'

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

» View all varieties of Heucheras

9 vendors have this plant for sale.

23 members have or want this plant for trade.


12-18 in. (30-45 cm)

12-15 in. (30-38 cm)

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)

Sun Exposure:
Sun to Partial Shade

Bloom Color:
White/Near White

Bloom Time:
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater
Suitable for growing in containers

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 the rootball

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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By keno
Thumbnail #1 of Heuchera  by keno

By Kruch72
Thumbnail #2 of Heuchera  by Kruch72

By esw
Thumbnail #3 of Heuchera  by esw

By henryr10
Thumbnail #4 of Heuchera  by henryr10

By flowerfrenzy
Thumbnail #5 of Heuchera  by flowerfrenzy

By growin
Thumbnail #6 of Heuchera  by growin

By sanannie
Thumbnail #7 of Heuchera  by sanannie

There are a total of 26 photos.
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8 positives
No neutrals
No negatives

Gardeners' Notes:

Positive in2art On May 7, 2013, in2art from Bellevue, WA (Zone 8a) wrote:

This is the best performer of all the Heucheras I have. Stays evergreen in winter and looks like a small shrub in summer (5-10 times larger than the others). I grow it in full sun. If it starts to get leggy, mound some soil up on it (don't cover crown) and it will grow additional roots on stems, or break them off and pot them.

Positive donp17 On Apr 28, 2011, donp17 from Arlington, VA wrote:

Incredible plant. I took a chance and put it in container on an east facing wall, and mostly no chance of getting other watering than rain.

It took our usual droughts as though it was in the sedum family. Some leaves persisted through the winter giving it some presence.

Now that it's Spring again, it's taken off.

Color is great all seasons.

Positive wickerparker On Oct 2, 2006, wickerparker from Chicago, IL (Zone 5b) wrote:

This heuchera has performed very well for me, in a number of spots with differing conditions. Holds its dark foliage color from spring till frost.

Positive pirl On Jun 7, 2006, pirl from (Arlene) Southold, NY (Zone 7a) wrote:

Love the depth of color! Well behaved in partial shade.

Positive franbo 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)

Positive keno 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.

Positive esw 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...

Positive Kruch72 On Oct 16, 2004, Kruch72 from Elgin, IL (Zone 5a) wrote:

Very nice foilage.


This plant has been said to grow in the following regions:

Kenai, Alaska
Denver, Colorado
Farmington, Connecticut
Old Lyme, Connecticut
Waterbury, Connecticut
Cordele, Georgia
Chicago, Illinois
Mount Prospect, Illinois
Plainfield, Illinois
Russell, Kentucky
Haydenville, Massachusetts
Norton, Massachusetts
Plainwell, Michigan
Silver Lake, Minnesota
Litchfield, New Hampshire
Cape May Court House, New Jersey
Averill Park, New York
Southold, New York
Boone, North Carolina
Durham, North Carolina
Pekin, North Dakota
Cincinnati, Ohio
Coshocton, Ohio
Ravenna, Ohio
Enid, Oklahoma
Portland, Oregon
Norristown, Pennsylvania
Philadelphia, Pennsylvania
Conway, South Carolina
Memphis, Tennessee
Montpelier, Vermont
Alexandria, Virginia
Arlington, Washington
Bellevue, Washington
Kalama, Washington
Kirkland, Washington
Vancouver, Washington

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