For example, crab apples can pollinate apples, and the ornamental Bradford pear can pollinate pears. For fruits that require cross-pollination, refer to the individual chapters covering those fruits. Cross-pollination is always needed to produce an adequate fruit crop. Fruit set and crop size are improved by cross-pollination. All varieties, except Stella and Lappins, are self-unfruitful.
Most varieties are self-fertile.
To assure good crops, consult an extension specialist to determine the proper variety mix to assure fruit set. Most varieties are self-fertile. All commercial varieties, except J. H. Hale, are self-fertile. All varieties are self-fertile, but a pollinator will increase the amount of fruit produced. To be on the safe side, provide pollinators.