Apples are pollinated by insects, with bees and flies transferring pollen from flowers of one apple tree to those of another ... rootstock is actually grown from the seed of an apple, often McIntosh ...
Each apple tree variety matures and bears fruit at a different rate. So, if you want apples fast, choose dwarf and semi-dwarf ... Some examples are Gala, Jonathan, McIntosh, Honeycrisp, and ...