There are several things you can feed your Christmas tree to keep it healthy and vibrant. Some of the most common items include water, tree food, and occasionally a light fertilizer. Make sure to keep your tree well-hydrated by filling its base with water every few days and adding a tree food tablet or liquid fertilizer to the water once a week. You can also give your tree a light trim to remove any dead or damaged branches and help it grow in a healthy direction. With the right care, your Christmas tree will last all season long!