Hi Mary Sue: My Rhodophialas have been spectacular this year in my greenhouses, and we have had an unusually warm summer. The temperatures in the greenhouses get up to 100F easily, but cool to about 55F at night during the summer. I don't water the Rhodophialas after the leaves dry off, so they are pretty dry. I remember reading somewhere that there is a bed of the red R. bifida at Kew that blooms well, but probably south facing and against a wall. It's probably not enough heat, Mary Sue. Speaking of heat, and off-topic, I have just installed Aluminet shade cloth in my greenhouses. Has anyone any experience with this material? It is a knitted aluminum coated shade fabric that is supposed to cut heat. Diana Telos Rare Bulbs http://www.telosrarebulbs.com/