This unique native perennial produces clusters of deep blue bottle-shaped flowers that never open, creating an intriguing garden display. Only strong bumblebees can force their way into the closed blooms for pollination. Forms neat clumps with lance-shaped dark green foliage.

Native range: Eastern North America from Maine to North Carolina

Size: 12-24 inches tall, space 12-18 inches apart

Growing conditions: Partial shade to full sun, moist well-drained soil

Bloom period: August through October

Wildlife value: Specialized pollination by bumblebees; attracts native bees

Garden benefits: Late-season blooms, unique closed flowers, naturalizes into clumps, shade tolerant