Yes, Christmas trees need water to stay healthy and fresh. It's important to keep the tree watered regularly, especially during the holiday season when the tree is exposed to dry indoor air. Watering the tree helps keep the needles from drying out and falling off, and also helps prevent the tree from becoming a fire hazard. You can water your Christmas tree by adding water to the base of the tree, where the branches meet the trunk, or by using a tree stand with a water reservoir. Make sure to check the water level daily and add more water as needed.