There are many ways to sell Christmas trees. One of the most common methods is to open a Christmas tree lot, where you can set up a physical location where customers can come and pick out their perfect tree. You can also advertise online or through social media to attract customers. Additionally, you could offer delivery services or offer special deals such as bundling the tree with other holiday decorations. Finally, you could partner with local organizations to promote your business and increase visibility. With some creativity and hard work, you can create a successful Christmas tree business.