My experience of Ledebouria cooperi is that it is hardy to minus ten centigrade, but not minus fifteen. I did not grow it with frost protection. Peter (UK) On 23 May 2016 at 18:34, <pelarg@aol.com> wrote: > Hi Robin, > It would certainly be hardy in Zone 9. Here we are the edge of zone 7/8 > in central/northern westchester county in NY. We got a low of -3F this > winter according to accuweather. > > > >