80% shade is a tough area to plant up! :
Here are some of my favourites.
For earlier colour try Bergenia, Primula, Epimedium and Pulmonaria. For later colour throughout the season try Ligularia's, Kirengeshoma, Aruncus, Chelone, Cimicifuga, Heuchera, Ferns and of course, Hosta. Be very...