Tall spikes of mauve and white flowers are held above lustrous, deeply-cut, thistle-like foliage. The hardiest species, they are vigorous, clumping architectural plants. Leaves and blooms are spiny. Requires well-drained soil.
Prefers part shade to light shade, but will tolerate sun with sufficient moisture. Requires well-drained soil. Drought tolerant once established. Deciduous. Long blooming. Attractive to butterflies. Deer resistant.