I have an L shape garden bed front of house to the side. The coral bells grew crazy big this yr & are looking terrible now , brown & spotted. I think they may be getting too much sun. I am looking for perennials that dont grow taller than 24 inches, the fire chief arborviate will eventually grow to 3-4 feet. I need a color that will work with fire chief arboviate. I am zone 6b. This is the sun schedule. Nothing casts any shade on this spot.