I was just sharing my experience with it - it may have been too cold in the pot for example. If you have space in the ground you could always plop it there.
I really don't do much to protect my plants, new or otherwise. They went through last winter with nothing more than the snow to insulate them. I do, however, try not to plant after the 15th. I am totally going to miss that deadline this year but not by too much. When I deal with the leaves in the fall I will spread them around the beds but it is never more than an inch thick and often much less than that.