I just moved into a house. The neighbor has a huge cherry tree with a lot of fruit. I have a cherry tree as well that is sort of growing sideways from the fence where the neighbor's tree is. I have a feeling it is a sucker that was let go and is now a tree. It looks healthy and there is fruit on it but the cherries are the size of peas. If this tree grew from a sucker, is that the result and can I cut it down without hurting the neighbor's tree?