a vigorous, semi-trailing hybrid annual (or tender perennial in warm zones) primarily grown for its abundant clusters of ruby-red, star-shaped flowers that bloom from late spring to mid-fall. It is prized for its high mildew tolerance, heat resistance, and all-season durability. It typically grows 8 to 12 inches (20-30 cm) tall and spreads 12 to 18 inches (30-45 cm) wide.