It adds a lay each year and if you have a screw, eye bolt or nail in the side of the tree eventually the item will be covered by the trees growth.It is a good idea to have something that can be removed and put in a different place as the tree grows.We have at least 25 to 30 pines on our lot and we have not lost one yet to nails or screws in the side of the tree.Reply:For the clothes line, I would put a