Christmas trees last longer if freshly cut--you can do this at a tree farm where you select the tree yourself, and one of the staff cuts it down. Look for leaves to be dark green in appearance, and have flexible needles. Needles should not break easily, and even the inner needles should not come off the tree when lightly pulled. If the tree was cut more than six hours before you get it home, it’s important to cut an additional half-inch slice off the base of the trunk right before you put it in the stand (it’s crucial you put the tree in the stand immediately after cutting in order to preserve freshness). Make sure the stand is large enough to allow for it to be regularly watered. Finally, place your tree in a cool spot--not in the path of direct sunlight, or near a fireplace or heat vent.