Results so far- all for C. x powellii: Elizabeth Lawrence's Charlotte garden Zone 7? 28" deep. Devon England Zone 7/8 2 ft Florida W. Coast Zone 8? above ground Kansas City Zone 5/6 18 inches minimum I guess this means I'll have to eat my Wheaties and dig a clump with yard stick at hand. My plants have been in their present site about 8 or 9 years. Jay thanks for kind offer; we'll have to 'talk'. Jim W. -- Dr. James W. Waddick 8871 NW Brostrom Rd. Kansas City Missouri 64152-2711 USA Ph. 816-746-1949 E-fax 419-781-8594 Zone 5 Record low -23F Summer 100F +