I grew up in Delaware, and a common, very lovely plant for shade gardens was Astilbe. White Flower Farm is advertising an astilbe that is hardy to zone 9. I'm tempted to try it, but I can't find anyone here that has grown astilbe - and for that matter, even heard of it! I'd love to hear if you have tried it, and what success you have had or not had with it. Thanks! :-)

Here is a link that might be useful: White Flower Farm