Do you put sugar in Christmas tree water?

There are mixed reactions on this subject. The study's author, tree scientists Les Werner says adding other mixtures like sugar, aspirin or even vodka doesn't help the tree stay longer. "Clean water still works the best." However, other scientists believe sugar can help since the combination of air, water and soil initiates photosynthesis in which sugar is produced. These scientists believe adding sugar can speed up this process of photosynthesis, thereby making plants fresher.