Common Name: spurge
Type: Herbaceous perennial
Zone: 6 to 8
Height: 2.00 to 3.00 feet
Spread: 1.50 to 2.00 feet
Bloom Time: May to June
Bloom Description: Greenish-yellow
Sun: Full sun to part shade
Water: Dry to medium
Tolerate: Rabbit, Deer, Drought, Dry Soil, Air Pollution
Grow in dry to medium, well-drained soils in full sun to part shade. Plants perform best in a Mediterranean-type climate, and may show stress in hot and humid summers. They must have sharply-drained soils. They dislike heavy clay. Plants generally have good drought tolerance, but appreciate some moisture in dry summer periods. Wet soils in winter can be fatal. Plants often decline after flowering. Cut flower stems off at the base after bloom to provide room for newly emerging stems. Plants are considered to be evergreen in warm winter areas. Plants are not reliably winter hardy in USDA Zone 6 (St. Louis) where, if attempted, they should be sited in protected locations.
Euphorbia characias subsp. wulfenii is an upright euphorbia that is native to Southern Europe, the Balkans and Turkey. It typically grows on erect, woody-based, green stems to 2-3' tall and to 2' wide. Narrow, linear to obovate, blue-green leaves (to 5" long) are spirally arranged along the stems. Each stem is topped in spring by a thick, bottlebrush-like inflorescense of greenish-yellow flowers with purple glands. Individual flowers lack petals, but have showy, petal-like, greenish-yellow bracts (cyathium in the genus Euphorbia is defined as a cup-like involucre). Subsp. wulfenii differs from the species by growing shorter (species grows to 3-4' tall) and by having more yellow in the flowers, darker purple on the glands and larger leaves. Broken stems exude a white milky sap that is a skin irritant and poisonous. Genus name honors Greek physician Euphorbus (first century A. D.).
No known serious insect or disease problems. Use gloves when working with this plant because of the toxic plant sap.