I would like to add my thanks to Dunk for the web reference. It is not only very informative but quite entertaining also. Clyde that would be a good reference point but certainly don't ignore Diane's recommendation to go to Robin's site and consulting with her. She is quite well informed. I would only say that many of the hardy Geraniums do well in partial shade and a few like G. Macrorrhizum thrive even in dry shade conditions. Hope you find the "companions" you seek :-) . Dale Neil (zone 5 ILL )