I also vacuum the tree each time I vacuum the rest of the house, about every two weeks. (I know I should do it weekly, but ye-gads, huh?) About every few months I get out the scissors and trim all the little threads they have pulled loose while shredding the post. It makes it look a lot better and not so bedraggled. Occasionally I will brush the fur off rather than vacuuming. Especially in the summer!