|This is a fast growing, spreading perennial, treated as an annual in cooler areas. Flowers profusely throughout the summer, attracting butterflies. Leaves are 2 to 4 inches long, dark green, ovate with slightly toothed edges. The white blooms appear in domed clusters, covering the plant from late spring to late autumn. Thrives with full sun, low moisture and poor soil. Withstands salt spray too.