R. arboreum ssp. cinnamomeum 'Roseum'Here is an Arboreum rhododendron that grows up to 20 ft tall, but only 6 ft wide. The flowers are in full, round trusses of 25, light pink flushed dark pink, and bloom in February March. The leaves are very dark green and shiny. Also, the undersides of the leaves are covered in a rusty orange indumentum that adds interest. Hardy to zone 7.