Prunus umbellata Large crops appear only every 3-4 years. Prunus umbellata Prunus umbellata, called flatwoods plum, hog plum and sloe plum, is a plum species native to the United States from Virginia, south to Florida, and west to Texas. "Prunus umbellata" can reach in height with a spread. It has alternate serrate green leaves that turn yellow in Autumn. Flowers are white, creamy, or grayish. Fruits are round, purple, and in diameter. "P. umbellata" trees can live up to 40 years and are very difficult to distinguish from "Prunus angustifolia", with which it hybridizes easily. The trees bloom and bear fruit later
Prunus simonii is particularly aromatic, much more so than "Prunus salicina", with a comparatively high level of hexyl acetate, which gives apples their aroma. Plant breeder Luther Burbank devoted a lot of work to hybridizing this species with the Japanese plum ("Prunus salicina") and developed a number of cultivars from the hybrid. Of these, the cultivar 'Climax' was particularly notable for its importance to the fruit shipping industry of California. Other influential plum cultivars that Burbank developed with "P. simonii" ancestry include 'Maynard', 'Chalco', 'Santa Rosa', and 'Formosa'. Those two species and the European species "Prunus cerasifera" have contributed the majority of