Dear PBS, Althought I do grow H. x johnsonii out doors, Rhodophiala by comparison IS NOT hardy for me. We generally have wettish winters - snow and cold rains. Soil is moisture retentive clay based. Best Jim W. On Feb 23, 2016, at 11:21 PM, Eugene Zielinski <eez55@earthlink.net> wrote: I'm glad Jim Waddick mentioned Hippeastrum x johnsonii as one of the hardiest garden amaryllises. Scott Ogden (Garden Bulbs for the South) lists this as an old (ca. 1810) hybrid of H reginae and H. vittatum. Thad Howard (Bulbs for Warm Climates) said he was "amazed to find H. vittatum growing in sandy woodlands (in Brazil) at a depth of 6-8 inches." I used to live in Augusta, Georgia, and H. x johnsonii grew very well there. Eugene Zielinski Prescott Valley, AZ USA James Waddick 8871 NW Brostrom Rd Kansas City, MO 64152-2711 USA Phone 816-746-1949