Perennial: Semi-evergreen. Drought tolerant. Small scale ground cover or use as filler between stepping stones or paving blocks. Reseeds. Attracts butterflies. Bloom time: spring-summer. Bloom color: dark purple. Height: 3 inches. Width: 6 inches. Exposure: part shade. Water: moderate/dry. USDA Z2. Hardy to 0 deg. or below.