Let's continue this discussion by discussing bulbs that do well in partial to medium shade. Alliums do well on the northwest side of this shade garden. Apparently a few hours of sun is enough for them even though they are supposed to be full-sun plants. Alliums attract both butterflies and bees. Visit here for a listing of articles and pictures of Alliums available on the Web.
Caladiums are wonderful in the shade or as houseplants .
Slugs love these plant. I surround them with a layer of diatomaceous earth. Another way to protect them would be to plant them in four-inch pots and partially bury them. Then surround the pot with something to deter slugs. I find their unusual flowers fascinating.