The lifespan of a Christmas tree can vary depending on its species, where it was grown, and how it is cared for. Most Christmas trees will last several weeks if properly maintained, but some can last up to six weeks or more. The key is to keep the tree well-watered and away from heat sources that can dry it out. However, even with proper care, a Christmas tree is a temporary decoration that should be replaced each year to ensure optimal health and safety.