European plums will not pollinate the hybrid plums and vice versa. Fruit trees which require two different varieties for pollination should be planted within 50 to 100 feet of one another to insure good fruit set. Gooseberries are self-fruitful. Elderberries are essentially self-unfruitful. Plant two or more varieties to insure good fruit set.
Grapes are self-fruitful.
Raspberries are self-fruitful. Strawberries are self-fruitful. Home gardeners should keep these fruiting requirements in mind when browsing in garden centers or leafing through garden catalogs. 1994 issue, pp. Iowa State University , Ames, Iowa.