Euphorbia, Cypress Spurge, Bonaparte's Crown, Graveyard Moss 'Fen's Ruby'

Euphorbia cyparissias

Family: Euphorbiaceae (yoo-for-bee-AY-see-ee) (Info)
Genus: Euphorbia (yoo-FOR-bee-uh) (Info)
Species: cyparissias (sy-par-ISS-ee-ass) (Info)
Cultivar: Fen's Ruby



Foliage Color:


Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Suitable for growing in containers


12-18 in. (30-45 cm)


9-12 in. (22-30 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)

Sun Exposure:

Sun to Partial Shade


All parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Chartreuse (Yellow-Green)

Bloom Time:

Mid Spring

Late Spring/Early Summer


Grown for foliage


Other details:

May be a noxious weed or invasive

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

From herbaceous stem cuttings

Seed Collecting:

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


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

Wasilla, Alaska

Clayton, California

Knights Landing, California

Canaan, Maine

Ludington, Michigan

Saint Helen, Michigan

Southold, New York

Salem, Oregon

Clarksville, Tennessee

Cascade-fairwood, Washington

Spokane, Washington

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Gardeners' Notes:


On Feb 25, 2014, coriaceous from ROSLINDALE, MA wrote:

A noxious weed here in Massachusetts, spreading both by seed and underground by stolons. In the garden, this is a nasty thug, hard to control and impossible to eradicate. I suspect that it can escape from a sunken pot by seed or through the drainholes.

Here in Massachusetts, its trade, sale, transport, and planting are illegal, because of the damage it does to natural areas. Likewise in one other state. Colorado has declared it a noxious weed.

If you're trading divisions of perennials from your garden and you also grow this, please warn your trading partners.


On Mar 12, 2013, Cville_Gardener from Clarksville, TN (Zone 6b) wrote:

It can be invasive but it has its place. Hardy, interesting. I very much like it when it is contained.


On Aug 20, 2011, Spokaloo from Spokane, WA wrote:

Spreads like crazy. This is growing in a xeriscape landscape under a conifer. It STILL grows like crazy. I really can't decide if I'm happy about it or not. I'll worry about it next year.


On May 11, 2006, SeattleSuze from Renton, WA wrote:

Very beautiful groundcover that spreads like wildfire and is extremely difficult to remove. Visitors always comment positively on it and are thrilled with its softness. I manage it by pulling up every plant until its finally covered by the perennials. What's left of it grows and creeps out to the edge of the border in all its glory. I am more ambivalent about this plant by far than any other in the garden.


On Feb 1, 2006, sedum37 from Westford, MA (Zone 5b) wrote:

Avoid this plant as it spreads aggressively via underground runners. It is nearly impossible to remove once planted. I mistakenly planted this in my garden and have been trying to eradicate this for 5 years now. Contact with the white sap produced from broken foliage causes rashes in some people. Avoid getting it on your skin or in your eyes. If you must grow this plant, grow in pot sunk in the grown to control the spread of this plant.

Invasive prohibited in Massachusetts.