Used as substitutes for annuals in planting beds or containers, as low hedges, and as foundation shrubs. Spreading kinds used for ground cover. Coarse, upright to 6 ft., medium-sized shrub, rather prickly. Fast growing, valued for profuse show of color over long season. Rough dark green leaves with small teeth on the edges.
Many colored flowers are orange to yellow or orange changing to red, pink or white.
Prune hard in spring to remove dead wood and prevent woodiness. Crushed foliage has strong odor that is objectionable to some people. Has become a noxious weed in Australia and some other warm areas.