Christmas Tree's roots will need water every 2-3 days. Without enough water, the tree will start to droop and the needles will turn brown. Keeping the tree well-watered will help it stay fresh and healthy. Christmas Tree suggests using a large pot of water, filling it with water every few days, and pouring it into the soil around the tree to keep it moist. Remember to check the moisture level of the soil to ensure the tree is getting enough water.