Perennial: Heat & humidity tolerant. The Empress Sun Kiss series is a high-performance verbena known for its long-lasting blooms (particularly in hot & humid conditions), vigor, and uniform habit. Good for containers, window boxes, hanging baskets, borders, & beds. Attracts butterflies & hummingbirds. Blooms: spring-fall. Color: dark red. Height: 10-14 inches. Width: 12-20 inches. Exposure: sun. Water: moderate/dry. USDA Z9.