Show all american plumes are in need of pollination practically all varieties of american plums appear to be self sterile but since none of t the varieties of this particular type are of any great commercial importance the question of pollination nation is of little importance as far BS as the commercial fruit grower fis is concerned most varieties of japanese plums are also self sterile and therefore require cross pollination preferably by a variety of the same species or type that Is two varieties of the japanese type such as abundance and burbank will pollinate each other but neither delther one can be depended upon to pollinate a variety of the european type such as green gage or lombard several of the european varieties of plums appear to be partially self belt fertile among the varieties usually placed in tills this class are italian prune helne claude and yellow egg most varieties of this type are inter fer tile among themselves but inter ster lle ile when crossed with varieties of the american or japanese type |