Christmas tree out to the curb. Somehow, contributing to the demise of such a magnificent living thing seems to drain the last of the Christmas spirit. More and more people are keeping the Christmas spirit alive, literally, by purchasing a living Christmas tree. These trees can be planted after the holiday is over, and they grow up to help clean our air and green our towns. While it takes some planning and extra leg work, having a living Christmas tree is quite feasible, even in an urban setting or apartment, and will make your joy this season extra special.