Jane, I estimated that most Alstromerias have a hardiness threshold of about 0 F [-18 C]. Garak's -11C falls well above that threshold. I based my estimate on Sunset, L.H. Bailey's Hortus III, and the RHS garden Plant Index. On 4/29/2022 8:53 PM, Garak via pbs wrote: > I can confirm that Ligtu hybrids, psittacinas and modern horticultural > hybrids can tolerate unprotected, snowless frost of -11°C for single > nights. Unlike the Ligtus, modern hybrids will lose overground growth > to late frosts, but usually return soon after. I agree that my mixed > winter climate is far more difficult for them than true continental > climate would be. The psittacina actually has more problems with my > dry summers, it's a really thirsty plant. > > Am 30.04.2022 um 05:25 schrieb Jane McGary via pbs: >> I don't know where this hardiness estimate came from, but I doubt it >> extremely. Any alstro that lives where temperatures go this low would >> spend the winter under seasonally permanent snow cover. I don't think >> they would tolerate freezing at the depth where the tubers and crowns >> lie. >> >> Jane McGary, Portland, Oregon, USA >> _______________________________________________ >> pbs mailing list >> pbs@lists.pacificbulbsociety.net >> http://lists.pacificbulbsociety.net/cgi-bin/… >> Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> > > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>