@Clymene
Oh god don't plant Japanese anemone. Bloody nightmare and you'll ever get rid of them.
Epimedium does well in shade, as does jacobs ladder.
@SockFluffInTheBath If conditions are right it will spread everywhere and it is
relentless. My NDN has it in her front garden and I've found it pushing through the boundary wall and pavement outside. It is a
nightmare if not contained.
Same with Vinca, very useful ground cover but unless you work hard it will take over and spread everywhere. It spreads like brambles, with arching stems that touch the ground and root at that point.
In my book, a good plant is one that spreads only gradually and is easily stopped. Some plants are lovely but just too much work to be worth the hassle...
Astrantias are great for shade, but the flowers smell like wee IMO. In my shady beds I have tricyrtum, dog's tooth violets, tiarella, epimediums, heucheras, astrantia, hellebores and cyclamen and snowdrops.
I also have a fabulous climbing rose, Madame Alfred Carriere. Flowers well even in a north facing aspect.