Hi Brian, I have experience growing this plant in two different climates, Los Angeles, California & Honolulu, Hawai'i. In L.A. it was very easily grown in the ground, going dormant each winter without temperatures approaching 0°C and then re-sprouting with blooms in early summer. Summers had plenty of heat and they were grown in full intense sun. They didn't seem to mind winter rainfall as long as the soil was well drained. In Honolulu they grow both leaves and tubers vigorously but never bloom, despite being dry-forced into dormancy each winter. I believe it is safe to conclude that this is due to a lack of sufficient cooling in the wintertime as temperatures never went below 15°C on the coldest nights in winter where I was growing them in Kaimukī. I would recommend higher daytime temperatures and light intensity during late spring and throughout summer. They have proved very heat-tolerant for me so I might suggest setting your plant high on a shelf close to the roof of your greenhouse. Jacob ---------- http://www.flickr.com/photos/morabeza79/sets/