The holiday tree, balsam, held its needles for three weeks in a cold room of the house (in the kitchen library where we keep it unheated through winter). The next two weeks we set the tree, with lights, out in the backyard, going strong. When the needles finally fall off the tough one, we'll then cut the tree up and burn it for warmth. For now it's a pretty warm light through the night.
photo © bob arnold