I can confirm hardiness at these conditions for Ipheion uniflorum too. Plants evolve to survive the most extreme condidions they may encounter. Even if this only needed once in a thousand years, in their natural habitat, -a useful fact for gardeners. Peter (UK) 2012/2/4 Jacek Zwoliński <ajzw@wp.pl>I can confirm full hardines in the following conditions: -20 C night/ -15 C day for 10 days continuously without snow cover (last winter). _______________________________________________ pbs mailing list pbs@lists.ibiblio.org http://pacificbulbsociety.org/list.php http://pacificbulbsociety.org/pbswiki/