@ssgardener I do not think it is the cold that kill them but the wet feet.
I have the perfect sun, soil and drainage area. The area is a woodland floor soil comprised of leaf mold and compost over a foot of gravel
Our wet winters kill.....a lot of rain with sudden temp drops down to freezing. They end up in a block of ice. On top of that ice we will get a few inches of snow which will thaw that does not help because then we go back to the rain, freeze, etc.
