To tie a Christmas tree ribbon, start by taking a long piece of ribbon and looping it around the top of the tree. Then, take the ends of the ribbon and crisscross them, making a figure eight. Next, pull the ribbon down and around the tree, tying it off at the bottom. Finally, adjust the ribbon so that it is even and straight, and then fluff it out to add some volume. And there you have it, a beautifully decorated Christmas tree ribbon!