Most peach varieties are self-fruitful. Most pears are self-unfruitful. A few varieties, such as Kieffer, will set a fairly good crop without cross-pollination. However, for maximum fruit production plant at least two different varieties. However, some European and hybrid plums can be successfully grown in the state.
European plums are partially to entirely self-fertile.
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.