Perennial: Evergreen. Deer resistant. Drought and heat tolerant. Purple Dome will burst with color in the late summer, providing a spectacular show when much of the garden has finished for the season. A compact heavy blooming variety which displays excellent resistance to mildew. Attracts butterflies and bees. Bloom time: fall. Bloom color: pruple. Height: 18". Width: 3'. Exposure: sun. Water: dry. USDA Z3.