It maybe garden lore but I heard the following story from about 30 years ago . Someone placed his orchids during his holliday in a friend big aplle store ( temp?) All his plants were ruined/killed on return. Ben J.M.Zonneveld Institute of Biology,Leiden University, Clusius lab Wassenaarse weg 64, 2333 AL Leiden, The Netherlands Zonneveld@rulbim.Leidenuniv.NL Fax: +31-71-5274999. min temp -10C (15F)