If you’ve grown up with the tradition of having a fresh-cut Christmas tree in your home, it’s likely that at some point you’ve had a Douglas Fir. According to the National Christmas Tree Association, the Douglas-fir tree species (Pseudotsuga menziesii) has widely been the most popular for Christmas trees in the United States since the 1920s, today being shipped to the majority of states including Hawaii, and also Guam and Asia.