Hydrangeas, a bunch of kinds of iris, strawberry begonia, foxgloves, impatiens... Anyone care to suggest plants that would look good with those and do well in moist, rich but well-drained soil full of tree roots and speckled shade?

Goatsbeard & astillbes. Cinnamon & ostrich ferns.

Ligularia, red dock, chelone, solomon's seal.

Jap Iris, Itea, Canadian Ginger, Jack in a Pulpit, Buttonbush, Cliftonia, Elephant ears, Seashore Mallow, Titi

begonia grandis (hardy begonia) ... this plant tolerates every condition in my yard, from the dreadful to the sublime - but it's particularly fond of moist shade.