Depending on the variety you choose, some fruit trees are self-pollinating and some require a pollinator. Self-pollinating fruit trees include apricots, nectarines, peaches, and sour cherries; whereas fruit trees that require pollinators include apples, pears, plums, and sweet cherries.
Do you need two fruit trees to pollinate?
Pollination Basics
Most fruit trees require pollination between two or more trees for fruit to set. Pollination occurs when the trees blossom. Pollen from the anthers (the male part of the plant) has to be transferred to the stigma (the female part of the plant).
Do self-pollinating fruit trees need bees?
Some fruits are self-pollinating, and can fertilize themselves without any bees involved. The Navel Oranges seen in the photo at the top are a good example of a fruit that can self-pollinate. Most fruit trees -- pears and apples in particular -- are self-sterile for their own pollen.