My friend's yard

So I have a friend, who not to long ago bought a historic building and the 3 acres of Chester Co. it sits on. Its a lovely strip of land with a creek running though it. He asked us if we would work on two gardens for him. A shady, wet-tolerant, flower garden and a rain garden. This weekend I put some thought into the flower garden.

Royal Hellebores

Indian Pink

Toad lilies

and Spiderwort

Any one have any other suggestions?