Fruit tree species require pollination in order to set fruit. Pollination occurs when pollen is transferred from the male part of the flower to the female part of the flower by way of birds, bees, insects or even the wind. Certain fruit trees have the ability to pollinate themselves, while others require cross-pollination from other trees.
Knowing which varieties of trees need cross-pollination, and which are self-pollinators can help you in the tree selection process for your tree plot.
To find out if the species you are looking for needs a cross-pollinator, please see the description of Trees by Species section.