I have 2 x silver birch trees which are about 12 feet long and not very wide as I have cut down most of the branches to keep them contained and a Magnolia tree which is of roughly of the same height but quite wide, these trees are about 2-3 meters away from the outbuilding. My questions are, would they cause a damage to it, should I get them removed? Would silver birch will survive in a very large pot? I don't have the heart to get rid off them. They have been there for nearly 8 years now. Thank you