hardy plants for light/medium shade?
My new (to me) house has a well established shrub garden on the north side of the house. It receives several hours of filtered afternoon shade, enough for the mockorange shrub to bloom although not profusely. The soil is slightly heavy but good and has good drainage (on a light slope). There are already Arum italicum and a big Aruncus, some feralized harebells, and a carpet of Spanish bluebells in spring.
In some of the gaps that weeds are currently colonizing, I'd like to add perennials, but I want plants that fit in well with a wilder look -- this is an area where I'd prefer to encourage tough desirable plants and generally keep the chaos down to a dull roar.
I'm drawing a blank on good prospects except for common violet, which I'll probably add toward the front where I want groundcover. Naturalizing or self-sowing plants are a plus. Any suggestions? I had a shady garden years ago but I've forgotten most of what I put in it.