Our apple trees, like many fruit trees, are propagated by grafting; joining a scion (which becomes the fruiting part, or top of the tree) to a root-stock (which becomes the root of the tree). Grafting allows the two parts to grow together and function as a single plant. Although the rootstock has an influence on the ultimate size and hardiness of the tree, the scion alone determines what kind of fruit the tree will yield. Therefore, when we produce fruit trees for northern climates, there are two things to consider: Which Rootstock to use, and which "cultivars" (cultivated varieties) to graft onto that rootstock.
Both much be hardy and vigorous enough to withstand the lowest winter temperatures and strongly during a short season.
For more information about our apple trees check out: Apple Trees