Euphorbia Species, Cushion Spurge

Euphorbiapolychroma

Family
Euphorbiaceae (yoo-for-bee-AY-see-ee)
Genus
Euphorbia (yoo-FOR-bee-uh)
Species
polychroma (pol-ee-KROH-muh)
Synonym
Euphorbia jacquinii
Euphorbia lingulata
Euphorbia microsperma
Euphorbia polychroma
Tithymalus epithymoides
Sun Exposure
Full Sun
Foliage
Herbaceous
Height
12-18 in. (30-45 cm)
Spacing
18-24 in. (45-60 cm)
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)
Danger
All parts of plant are poisonous if ingested
Handling plant may cause skin irritation or allergic reaction
Bloom Color
Bright Yellow
Bloom Time
Late Spring/Early Summer
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Chartreuse/Yellow
Orange/Apricot
Where to Grow
Bloom Characteristics
Bloom Size
Other details
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
Non-patented
Propagation Methods
From seed; sow indoors before last frost
From seed; direct sow after last frost
Seed Collecting
Bag seedheads to capture ripening seed
Properly cleaned, seed can be successfully stored
Regional

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

Juneau, Alaska

Seward, Alaska

Logan Lake, British Columbia

Sonora, California

Stamford, Connecticut

Blackfoot, Idaho

Fort Dodge, Iowa

Iowa City, Iowa

Ewing, Kentucky

Bel Air, Maryland

Silver Spring, Maryland

Chicopee, Massachusetts

Dracut, Massachusetts

North Easton, Massachusetts

Springfield, Massachusetts

Constantine, Michigan

Ludington, Michigan

Stephenson, Michigan

Tustin, Michigan

Chaska, Minnesota

Saint Paul, Minnesota

Fort Benton, Montana

Whitefield, New Hampshire

Himrod, New York

Jefferson, New York

Akron, Ohio

Findlay, Ohio

Galena, Ohio

Grove City, Ohio

Bend, Oregon

MOUNT HOOD PARKDALE, Oregon

Norristown, Pennsylvania

Wilkes Barre, Pennsylvania

Orangeburg, South Carolina

Clarksville, Tennessee

Johnson City, Tennessee

Knoxville, Tennessee

Provo, Utah

Salt Lake City, Utah

West Dummerston, Vermont

Clarkston, Washington

Clarkston Heights-Vineland, Washington

Elma, Washington

Spokane, Washington

Stanwood, Washington

Sunnyslope, Washington

West Clarkston-Highland, Washington

West Wenatchee, Washington

Green Bay, Wisconsin

Madison, Wisconsin

New Richmond, Wisconsin

show all

Featured Videos

Gardener's Notes:

9
positives
1
neutral
1
negative
Sort By:
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A
A
West Jordan, UT (Zone 7a) | July 2022 | positive

One of my favorite perennials; I love watching them change colors through the seasons. They're fairly drought tolerant and very heat tole...Read More

I
I
Iowa City, IA (Zone 5a) | May 2014 | positive

I planted two last fall - one next to the house, and one further out in the yard. As they came up in the spring, rabbits repeatedly munc...Read More

T
White Oak, MD | January 2013 | positive

The electric yellow of this beautiful plant works in a weird, wonderful way with the electric blue of flax flowers, especially in the eve...Read More

F
Ludington, MI (Zone 6a) | May 2012 | positive

My favorite euphorbia, it is so low maintenance and looks good for the whole growing season. Brilliant yellow "flowers" in spring, neat s...Read More

W
Spokane, WA (Zone 5b) | March 2010 | positive

This is one of my all-time favorite perennials. It blooms with the daffodils, and looks as though it was carefully pruned into a perfect ...Read More

M
M
Columbus, OH (Zone 5b) | September 2009 | negative

I’m a physician who recently had a fairly severe eye injury from the toxic residues of Euphorbia polychroma. I actually discovered the ...Read More

G
Juneau, AK | June 2008 | positive

I've grown this plant in many climactic conditions, from hot, dry alkalai soil in southwest Idaho to cool, moist acid soil in Southeast A...Read More

F
Sonora, CA | April 2007 | positive

I love this plant. I love how it is such a perfect mounding plant and the yellow is electric when it blooms. I have it at the front edge ...Read More

B
Braselton, GA (Zone 8a) | March 2007 | neutral

EUPHORBIA POLYCHROMA Cushion Spurge - Short 14" - Plant 12" apart. Zone 3-8 Forms a globe shaped mound with attractive foliage. Related t...Read More

S
Brockton, MA (Zone 6a) | May 2006 | positive

A lovely non-invasive, long lived perennial.
Makes a big yellow mound at the same time as the late Tulips.
The seed may no...Read More

S
(Zone 6a) | March 2006 | positive

Easy to grow. I grow mine in clay soil in part shade, and, it increases in size fairly quick forming a nice mound. Yellow flowers with br...Read More

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