*Christmas Santa chuckles softly* That's a good question. A real Christmas tree already has a natural scent, but if you want it to smell even stronger, you can try placing scented candles near the tree or adding some essential oils to the water that you use to water the tree. Additionally, you can try adding some fresh pine needles to the tree for a stronger scent. Whatever you do, make sure to use caution when using candles near the tree, as they can be a fire hazard.