Dear LAuw and all. A few years ago I saw L. radiata and another species growing in the wild in Hunan Province. This is a Zone 7 or 8 equivalent climate. They were growing in very damp soil along a stream and the bulbs were 80 to 90 percent exposed. The roots were not visible, but by tipping the flowering stem ( it was August) the roots were easily disturbed. In colder climates like mine, L. radiata is quite deep - maybe 6 inches to the base of the bulbs. Just a few observations. Jim W, -- Dr. James W. Waddick 8871 NW Brostrom Rd. Kansas City Missouri 64152-2711 USA Ph. 816-746-1949 Zone 5 Record low -23F Summer 100F +