Euphorbia characias subsp. wulfenii, or simply Euphorbia wulfenii or Mediterranean Spurge an evergreen sub-shrub, is considered a biennial by many since the flowering branches need to be cut back to the ground. In many cases, it blooms in the second year and then should be cut. Cut back in late summer or autumn. It is native to the Mediterranean and from the Euphorbiaceae family of plants.
It prefers the sun and well-drained soil. Euphorbia characias subsp. wulfenii is drought-resistant. Watch out for aphids otherwise, it is disease-free. You can propagate Euphorbia characias subsp. wulfenii from basal cuttings in early spring or division in early spring. When doing cuttings, in order to prevent bleeding deep cut in lukewarm water.