Most varieties are self-unfruitful. Most peach varieties are self-fruitful. Most European pears are self-unfruitful. Plant at least 2 different varieties for maximum fruit production. However, European and hybrid plums can be successfully grown in the state.
European plums are partially to entirely self-fertile.
Plant 2 or more hybrid plum varieties to insure cross-pollination and fruit set. 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.