|This rhizomatous or tuberous evergreen or semi-evergreen perennial is grown primarily as a low maintenance ground cover. It is best when used in large, sweeping masses rather than spotty, individual clumps. Racemes of pale violet-purple flowers are produced in late summer. Both drought and shade tolerant, this versatile plant can grow in full sun or moist sites just as easily. Prefers acidic soil. Excellent on slopes or at the base of trees were roots will not permit grass to grow. To maintain an attractive appearance, cut back tops each February before new growth begins.