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 On 4/29/2022 6:19 PM, Marc Rosenblum via pbs wrote: > Alstroemerias have a hardiness threshold very close to 0F [-18 C] > Ligtu hybrids might push this a bit. If you expose them to colder > temperatures without protection, you risk losing them. > > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>