Coral Bells, Alumroot, Coralbells, Alum Root 'Blackout'


Family: Saxifragaceae (saks-ih-frag-AY-see-ee) (Info)
Genus: Heuchera (HEW-ker-a) (Info)
Cultivar: Blackout
Additional cultivar information:(PP20613)
Hybridized by Scheys
Registered or introduced: 2008
» View all varieties of Heucheras




6-12 in. (15-30 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)

Sun Exposure:

Sun to Partial Shade

Bloom Color:


Bloom Time:

Mid Summer


Grown for foliage


This plant is resistant to deer

Other details:

Unknown - Tell us

Soil pH requirements:

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

Foliage Color:



Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Suitable for growing in containers


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

Dracut, Massachusetts

Royal Oak, Michigan

Orchard Park, New York

Coshocton, Ohio

Williamsburg, Ohio

Norristown, Pennsylvania

Wilkes Barre, Pennsylvania

Freeland, Washington

Kalama, Washington

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Gardeners' Notes:


On Aug 11, 2013, mehitabel45 from Whidbey Island, WA (Zone 8b) wrote:

Really dark foliage if grown in the shade. This is the third year for this, and it bloomed beautifully, although the flowers are tiny, and white, and really don't add much to the enjoyment of the wonderful foliage. I think that the deer may have been munching on them a little recently. That was a surprise. They've ignored it for 2 years. It looks like it's ready to be divided this year. I'm excited, because it has been a pleasure in my shade garden. I'll be putting the division in good compost in partial shade near some silver fuzzy and lacy medium green foliage. Woohoo!


On Mar 24, 2012, beansandpenney from Orchard Park, NY (Zone 5a) wrote:

I have several coral bell varieties in my afternoon shade garden, however I believe this one reseeds itself? It is planted next to a flagstone patio and as we speak, there are several Heuchera seedlings sprouting up between the cracks of the flagstone near where Blackout is planted. Has this plant or any other heuchera variety done this? Seems odd! Well, I'm going out to pot 'em up!


On Nov 24, 2009, stormyla from Norristown, PA (Zone 6b) wrote:

These Heuchera did not survive their first summer for me. They just dried up and died. They seemed to need more water than my others.