Tour of Arnold Arboretum
Rhododendron 'Purpureum Grandiflorum'(Waterer)
Picture by S & J Perkins
This was labeled as 'Purple Grandiflorum' from Waterer but the name does not exist in registration. Arnold Arboretum in Jamaica Plain Massachusetts is famous for its large collection of hardy woody plants. The arboretum is open to the public.