We've got a young crab apple tree that we planted last November. When it arrived it already had apples, and they are not shifting. All are very well attached, by some miracle to my novice-gardener's eye, as they have been gently rotting for a while now. There are new buds forming on the tree, so it looks like it is doing ok.. but what should I do with the apples? If I don't pick them, when will they fall off??