Tribe7
Tomcat and MNT they might be fine at your places, we had them at our old place and we had really cold winter nights of less than 6 and ours were fine. I think the frost might be what kills them??? You could always try them. They do how ever get massive and spread.
We get big frosts over winter, this year we had several mornings of around minus 6-7 so may be a problem