I have success with Galore, Walenburg, Betty Corning and Little Nell on the northwest facing wall of my two story house. They get no sunlight until afternoon - early afternoon at the height of summer, and late afternoon in mid winter. They grow and flower well, but I live in the south where the sunlight is more intense. Also, they don't have to compete with any tree roots, so if the area you are thinking of is pretty close to the bradford pear tree, the tree root competition may be a problem.

Thanks! I will look into those!