Since I moved to Pittsburgh in 2003, we have gone from zone 5 to 6 as well. And the soil that came with my house was clay. I've amended an area or 2 each year, having yet to do my long narrow shade bed.
THANK YOU for such detailed info, which is very pertinent to my situation.
I have already discovered about 1/2 of the plants you mentioned. Now, with the guidance of this article, I shall go forth and seek out the others!
