Putting sugar in your Christmas tree water is a popular myth that's been流传 for centuries. The idea is that the sugar will keep the tree alive and make the branches stronger, but it actually does the opposite. The sugar feeds the bacteria and fungi that can harm the tree, causing it to lose its freshness and beauty. So, if you want to keep your tree healthy and looking its best, don't put sugar in the water. Instead, just make sure to keep it well-watered and in a cool, humid place.