Considering the many different types of apples we see at farmers markets and supermarkets, it may be hard to believe that apple trees are not as diverse as they should be. But it isn’t the fruit-bearing part of the apple tree that’s the problem, it’s the apple tree’s rootstock.
Most of today’s commercially produced apples are from trees that were bred in two parts—the fruit-bearing scion that makes up the higher branches and tree tops, and the rootstock that forms the roots and lower trunk.