Perennial Herb: The Glow Series have large blooms, are heat tolerant and have a compact, mounded growth habit. Received highest score at the Bavarian institute in Germany. Flowers early, is prolific, vigorous, and easy to grow! A great choice for low borders, edges, hanging baskets, window boxes, and containers. Attracts butterflies. Bloom time: spring-frost. Bloom color: sky blue with white eye . Height: 8-12 inches. Width: 12-14 inches. Exposure: sun/part shade. Water: moderate/moist. USDA Z9.