frank- we have a 40 ft monkey tree and we have cut the branches to about 15 ft up because it was becoming dangerous with the kids-those branches are deadlysharp. Anything we do to that tree does not kill it or harm it in anyway. At the moment our drive has a load of flagstones sticking up because of it's roots. I would say if you cut the bottom branches off it'll be fine but I'm not taking any responsibility cos I'm sure our's has a mind of it's own. We have pigeons roosting in it, and we have the balls of monkey nuts growing at the top. It just lives on and on.