>Pinockio is tested in The Netherlands without cover at -18°C >my coldest winter here was -12°C Dear Roland and all, This cv is marketed as 'Pinocchio' in the US . I just went through a half dozen bulb references (it wasn't even in Phillips and Rix!) and found no hardiness recommendation colder than Zone 7. Close enough, but your -12 C is my 10.4 F and not even close to most winters here that get below 0 F or -5 F (-17 to -20 C). We get these temps for extended period of night and day, not just a passing overnight coldest temp. I need convincing they are hardy in Zone 5. Missouri is the 'Show Me ' state. 'Nuf sed' Best Jim -- 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 +