|This vigorous, thinly branched perennial (that you may want to confine) with basal clusters of oblong to lance-shaped, glossy, dark green leaves up to 3 feet long. Leaves are deeply cut and have spiny margins. Reaches up to 5 feet tall and about 24 to 36 inches wide. Spikes white flowers with purple bracts in late spring to midsummer. Cut back flower stalks after flowering, leaving foliage. Divide foilage from October to March. Prefers shady situations and occasional deep watering, but tolerates sunny, dry situations too. Its aggressive roots make this plant perfect for slopes. Excellent where coarse texture is needed in the garden.
Sometimes referred to as Spinossissimus Group, which includes Acanthus spinossissimus. These include varieties with deep gray to green foliage reaching up to 20 inches. Leaf margins are spiny and white with white midribs.