Heuchera, Alum Root, Alumroot, Coral Bells, Coralbells 'Green Spice'

Heuchera americana

Family: Saxifragaceae (saks-ih-frag-AY-see-ee) (Info)
Genus: Heuchera (HEW-ker-a) (Info)
Species: americana (a-mer-ih-KAY-na) (Info)
Cultivar: Green Spice
Additional cultivar information:(aka Eco-improved)
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6-12 in. (15-30 cm)


18-24 in. (45-60 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

Light Shade

Partial to Full Shade

Bloom Color:

Pale Green

Bloom Time:

Late Spring/Early Summer

Mid Summer


Grown for foliage

Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

Patent Information:


Propagation Methods:

By dividing the rootball

From leaf cuttings

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:

Unknown - Tell us


This plant is said to grow outdoors in the following regions:

Fort Smith, Arkansas

Lompoc, California

Los Angeles, California

Merced, California

San Jose, California

Moscow, Idaho

Mount Prospect, Illinois

Plainfield, Illinois

Greenville, Indiana

Barbourville, Kentucky

Durham, Maine

Skowhegan, Maine

Bridgewater, Massachusetts

Applegate, Michigan

Plainwell, Michigan

Hopkins, Minnesota

Minneapolis, Minnesota

Cape May Court House, New Jersey

Clementon, New Jersey

Elizabeth City, North Carolina

Raleigh, North Carolina

Belfield, North Dakota

Pekin, North Dakota

Coshocton, Ohio

Galena, Ohio

Powell, Ohio

Ravenna, Ohio

Portland, Oregon(2 reports)

The Dalles, Oregon

Albion, Pennsylvania

Mercer, Pennsylvania

Norristown, Pennsylvania

Christiana, Tennessee

Garland, Texas

San Antonio, Texas

Big Stone Gap, Virginia

Lexington, Virginia

Linden, Virginia

Portsmouth, Virginia

Stephens City, Virginia

Arlington, Washington

Arlington Heights, Washington

Oso, Washington

Smokey Point, Washington

Spokane, Washington(2 reports)

Stanwood, Washington

Appleton, Wisconsin(2 reports)

Madison, Wisconsin(2 reports)

Milwaukee, Wisconsin

Minocqua, Wisconsin

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Gardeners' Notes:


On Jun 14, 2013, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

This heuchera variety grows in one particular spot where no other heuchera will venture--not sure why, but it does well and looks really good. The flowers are insignificant, but the veining and coloration of the leaves is really striking.


On Jun 4, 2010, bonehead from Cedarhome, WA (Zone 8b) wrote:

Very attractive foliage and grows to a good sized clump quickly. The flowers on mine are pretty nondescript, no noticeable color to them and the long stalks tend to just fall over. I plan to just snip them off as they sprout and enjoy the foliage.


On Feb 23, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:

This heuchera do very well in my garden - no seedlings yet - seem to do well both light shade and woodland shade. Have a nice splash of variegation with maroon mixed in.


On Dec 3, 2005, willmetge from Spokane, WA (Zone 5b) wrote:

This is hands-down my favorite heuchera. Very nice form, leaf-shape, and exquisite pattern. It does great in a pot or in the ground and looks handsome year-round.


On May 24, 2005, PurplePansies from Deal, NJ (Zone 7a) wrote:

I have a real "like it" (not usually loooove it :) ) or "hate it" with heucheras..... some cultivars just leave me "lacking" on why I'd really want them in the garden and some bring a smile to my face.... this is one such heuchera.... perhaps it brings a smile because it is surprisingly decorative compared with many heucheras I've seen.... the foliage is really QUITE PRETTY.... multicolored (lime green lavender and purple) with a sort of smokey effect over it..... new mid - age- and older foliage have very different looks which adds to the plants interest..... easy to grow.... nice color in sun and shade but best color in part shade..... :)


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

Very nice heuchera first year plant. Did not bloom yet, but veins changed from red to to white.


On Jul 7, 2004, Chickma from Applegate, MI wrote:

This is my favorite Heuchera so far. I don't grow them in anything stronger than morning sun and have had great luck; this one is just beautiful. Mine is in its second year and is about 2'H x 2'W.