dying Bleeding Heart

I live in Chicago and I have an extensive container garden on my roof. What is a 'suitable sized container'? Bleeding hearts are seemingly bulletproof, but they do go dormant. And, getting them to return in a container in your zone could be tough. How big is the container? What is it made of? Did you put some sort of insulation in it? Depending on your answers, it may or may not come back. If it does survive, it will be gorgeous, for sure.