frostweed said:I am thinking of a few plants that would be good but I don't think they are cold hardy in your zone.
How about Coralberry, http://www.wildflower.org/plan...
If you get a Buttonbush be prepared to water it often, they like a lot of water.
I will think but with the zones being so different I may not have good suggestions.
CarolineScott said:Perhaps a sowing of a seeds mix which contains some perennial wildflowers?