Perennial: Drought tolerant. Resistant to deer, insects & diseases. Deciduous. Good cut flower, border & rock garden plant. Pinch 1/2 of plant by mid-July to allow plant to bush out. Bloom time: summer-fall. Bloom color: semi-double blue-purple. Size: 1-1.5' x 1.5'. Exposure: sun. Water: moderate/moist. USDA Z2.