Photo by Melody

PlantFiles: Cypress Spurge
Euphorbia cyparissias 'Clarice Howard'

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: Clarice Howard


6-12 in. (15-30 cm)

12-15 in. (30-38 cm)

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:
Full Sun
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:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Grown for foliage
Good Fall Color

Other details:
May be a noxious weed or invasive
Flowers are fragrant
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
This plant is resistant to deer

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From herbaceous stem cuttings

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

Click thumbnail
to view:

By saya
Thumbnail #1 of Euphorbia cyparissias by saya


No positives
No neutrals
3 negatives

Gardeners' Notes:

Negative coriaceous 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.

Negative crazy4plants On May 19, 2008, crazy4plants from Spokane, WA wrote:

I purchased a small four pack of this plant at Home Depot three years ago. I planted this along my nice new stream/water feature. The following spring I had a beautiful show of flowers and color, but much to my surprise this thing had multiplied everywhere, so I started my research. Much to my surprise, this plant spreads by runners and is VERY invasive and toxic to touch. I started spraying. I found the pulling can stimulate the roots and those roots were tangled up with many other very valued larger plants. Three years later, I am still spraying and pulling these plants out. Stay away from this plant unless you want problems. I had no idea that these kinds of problems were so readily available at nurseries. They are pretty but a a serious problem.

Negative saya On Mar 21, 2005, saya from Heerlen
Netherlands (Zone 8b) wrote:

This plant has needlelike foliage and lime-green strong honey scented flower heads. The new leaves are bright purpley red and fade to grey green, then turning bright yellow in autumn. According to various information I 've read about 'Clarice Howard' it should spread slowly if grown on a dry spot. spreads all over in my yard. This was, I hope I 'm lucky, only a young plant that could 'nt spread allover in my garden. I 've planted it immediately in a pot to give it some borders to spread. If you want to have a quick and handsome groundcover....this will look beautifull. Good Autumn colour. Blooms May to August. 10-20 cms high. Easily grown in light sandy soil.


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

Highland, Washington

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