Christmas tree farming and the disposal of natural trees has welfare implications for the wildlife that colonizes living trees and the insects that inhabit cut trees.
Christmas tree welfare is a minor but illustrative example of how commercial practices affect wildlife. Tree farm monocultures support far less wildlife than mixed forests. Invertebrates that colonize harvested trees are brought into warm homes where they cannot survive. The environmental calculus between natural and artificial trees is complex and depends heavily on how many years the artificial tree is used. Living tree programs that provide long-term urban green space are the most ecologically positive option.