|Vigorous perennial (that you may want to confine)
with basal clusters of lance-shaped, hairy, somewhat spiny dark green leaves. Spikes of light green flowers with light purple bracts appear from late spring to midsummer. Reaches up to 24 inches tall and about as wide. 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. Also referred to as Acanthus syriacus.