grafted is when they take the root system of one
tree, and attach the top part of a different
tree to it. like adding two pieces of pipe, and the graft is the "joint".
you can tell a graft because it will be thicker than the rest of the trunk. and the trunk will almost have a "seam" in the bark. usually at a diagonal, but sometimes in a "v". if a
plant has a "sucker" or off shoot from below the graft, the sucker will not be the same
plant as the top of the
tree. if the sucker is from above the graft it will, but it may not be as "root hardy" as the parent.