Perennial: A low maintenance and an easy to grow plant. Deer resistant. Good cut flower. Attracts butterflies. Fairly drought tolerant once established. Foliage turns golden yellow in the fall which adds to its appeal. Very floriferous with glossy green leaves. Great in mass plantings. Bloom time: spring-summer. Exposure: full sun. Water: moderate. Bloom color: star-shaped periwinkle blue. Height: 12-15". Spread: 20". USDA Z4.