Sorry, forgot to post this response, Yardenman.
Excellent advice from Cindy.
Re overwintering in pots; it always amazes me that so many perennials do so well after spending the winter, frozen solid in garden soil, in pots which were left out in a protected place and buried in snow.
The only danger I've seen here is having certain perennials rot in the pots in spring.
Am guessing that means these pots should have been moved out into the spring sun sooner.
