Hi Jim Shields and all, >How hardy is Iris wattii? I scanned my Iris books but found no specific USDA zone listed. It can handle 25 F here in Sacramento, California. Pat Brooks grows it in a large container. She moves container outdoors in spring/summer. Holds it indoors during cold weather. Kind regards, Joyce Miller Joyce E. Miller mailto:onager@midtown.net Zone USDA 9A Summer highs 100+degrees F for several to many days. Winter lows 27 degrees F