The tree grinding company dumped several truck loads of mulch at our place this year so hopefully this winter I'll get busy mulching before it gets too cold. Last winter was the coldest in 50 years and I lost fewer roses than the past 3 years, so part of it has to do with the age of the rose, I think. I didn't mulch and we didn't have snow. Maybe I killed off all the weaklings in prior years and now I just have tough ones?