If you have a cat who likes to climb trees, it can be a challenge to keep them from ruining your holiday decor. One way to keep your cat off the tree is to place aluminum foil or tinfoil on the lower branches. Cats don't like the crinkly sound or texture of aluminum foil, so it will discourage them from climbing. You can also put a few plastic bags on the lower branches to make them look and sound unpleasant. Additionally, you can use a spray bottle filled with water and spray your cat whenever they try to climb the tree.