I've read that Dogwoods don't do well in the deeper, more shaded parts, but there are so many that are actually doing quite well deep in my woods. Maybe the fact that it's all hilly helps them get more sun than they normally would or maybe I'm just lucky!
I actually did know that about butterfly bushes and I have two. I have also read that many of the butterflies in Virginia like Violets and Thistles, both of which I'm not sure I want to add since I've heard they're invasive, especially Thistles. Any other suggestions on plants that could be host plants or feeding plants? It's a partial shade area, as you can imagine I have very little full sun.