Growing apple tree from seeds is a bad idea. Instead, buy a dwarf or semi-dwarf grafted tree from a nursery. For choosing a right apple tree for your home you need to know a few things. Apple trees are grown from grafting on a rootstock as this has so many benefits. Basically, dwarf apple trees are those apple trees in which dwarf rootstocks are grafted to control their height, size and to improve fruit production and resistance against diseases and pests. When you go to a nursery or shop online, search for rootstock choices like M27, M26, Bud9, G16 or M9. Apple trees grown on these rootstocks are dwarf and don’t grow above 8 ft usually. Keep reading what to do in the source.
SOURCE:http://www.gardenoholic.com/how-to-grow-and-care-for-apple-trees-in-pots/