Well, first of all, make sure to water it regularly. Watering is one of the most important parts of taking care of a live Christmas tree. The tree needs enough water to keep its needles from drying out and turning brown. Be careful not to overwater it, though, as too much water can cause the roots to rot. Also, make sure to keep the tree away from heat sources like fireplaces or radiators, as this can dry out the tree and cause the needles to fall off. Finally, be sure to keep the tree away from pets or small children who might accidentally break it.