To keep your Christmas tree from drying out, you should always keep the tree well hydrated. Place it in a water-holding stand and keep the water level at least an inch above the base of the tree. Make sure the tree is away from heat sources, and keep the temperature moderate. Water the tree daily, and don't let the stand run dry. You can also mist the tree with water to keep it hydrated. Finally, make sure to regularly check the water level in the stand and top it off as needed.