The universal scientific name for apple trees is Malus pumila, but they are also referred to as Malus domestica, Malus sylvestris, Malus communis and Pyrus malus. Apple trees are extensively crossbred, making it difficult for scientists to distinguish purely distinct species, which is the reason for the array of names.
Apple trees are considered to be a small tree, averaging only 25 feet in height when fully grown. In late spring, the apple blossoms are pollinated by various insects and bees. The apples grow and ripen throughout the summer and are ready for harvest in the fall. Apple trees are not native to North America and belong to the rose family.