Watering the Christmas tree is an essential part of keeping it healthy and looking its best throughout the holiday season. The amount and frequency of watering will vary depending on a few factors, including the type of tree you have, the amount of humidity in the room, and the temperature. For most trees, you should water them every 3-5 days, but some trees may need more frequent watering. Be sure to use room-temperature water and avoid over-watering, which can cause the roots to rot. A good rule of thumb is to let the top inch or so of soil dry out before watering again.