What do you do with the poinsettias once the holidays are over? I'm about done with everything red and sparkly, so at the very least the outer foil has to go. As I recall, my mom used to keep them as houseplants although they never colored up again. I've read about the process to do that and it sounds pretty complicated. Do you just let them die a slow death, put them out of their misery, keep them on as green plants, or... ???