tall rhododendron for high shade
We have a raised platform on a slope facing southeast. We'd like to plant tall rhodies in front of it to fill in the space, and it's at least 7 feet tall. The slope is covered in mature trees with some younger lower trees that could be taken out, and it's zone 5. Is there any variety that can meet those conditions, preferably in deep red or white but any color that will grow well will do.