It is possible to plant a Christmas tree without roots, but it would require some special measures. Typically, a Christmas tree is planted in the ground and allowed to grow roots over time, which helps the tree survive and thrive. However, if you need to plant a Christmas tree without roots, you could try using a root stimulator or rooting hormone to encourage the tree to grow roots more quickly. Additionally, you could try planting the tree in a container with a special potting mix that is designed to promote root growth.