Christmas trees have a unique life cycle that is determined by the species and environmental conditions. On average, a Christmas tree can live for 8 to 12 years, depending on the species. Fir trees, such as balsam or Douglas fir, tend to live longer than spruce trees. However, the lifespan of a Christmas tree also depends on its care and the conditions it is exposed to. Proper care, including proper watering and fertilization, can extend the lifespan of a Christmas tree by several years.