Impatiens have become one of the most popular garden annuals. Hybrids, typically derived from "Busy Lizzie" (the well-known "I. walleriana") and the New Guinea Impatiens ("I. hawkeri"), have commercial importance as garden plants. "I. walleriana" is native to East Africa, and was bred through selection by Claude Hope. The original series of impatiens bred by Hope was the 'Elfin' series of cultivars, later improved as the 'Super Elfin' series. Double-flowered cultivars also exist. But in tropical islands, such as Hawaiʻi, Busy Lizzie can also become a noxious weed.