In the discussion of a Himalayan Typhonium (aroid) species, a correspondent remarked, "Due to the high elevations in the Himalayas to which it is native, I think summer heat will be an issue more than winter cold." You have to know what PART of the Himalayas a geophyte comes from. There are rain-shadow areas whose plants behave more like Mediterranean geophytes, growing in winter and dormant in summer. My main experience has been with Notholirion thomsonianum, which I found out by trial and error prefers such a cycle. I now grow it in the bulb frame with great success, and flowered it in the open rock garden (no summer water in that area) last year, too. Jane McGary Northwestern Oregon, USA