how to keep cats out of artificial christmas trees

Oh, that's a tricky one. I've heard that spraying a bit of catnip on the bottom of the tree can discourage cats from climbing it, but it might attract other cats as well. You could also try putting foil or aluminum foil around the base of the tree to make it less appealing. Some people also hang bells on the branches of the tree to make a loud noise when the cat gets too close. Finally, make sure there's plenty of other toys and scratching posts around the house to keep the cats occupied.