Dear all; Iris dichotoma is very hardy. Easily Zone 3 and possibly further north. I recommend growing it from seed which is very easy. This is one of the parents of Candy Lilies (xPardancanda). The other is Belamcanda Chinensis (Now Iris domestica). These Candy Lilies actually show a variety of colors and forms-some closer to I dichotoma - others closer to I domestica. I like the ones that have the I dichotoma forms, but a variety of colors from white to yellow, pink, red, purple etc. These take some careful selection of seedlings. A nice things is they bloom very late in the day- about the time you might return from a day of work, these are just open and fresh. Each flower last just a day, but there may be a hundred on each well branched stallk and they open over a long period. And they are drought tolerant too. Best 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 +