Anna Rose Whitney Rhodendron Hybrid. The group of plants commonly called azaleas are actually classified by botanists as belonging to the Genus Rhododendron and the name for each type of azalea has both the word “Rhododendron” and the species name, just as with other rhododendrons. This genus includes a species that is sometimes placed in the genus Ledum. There are about 1.000 species , of which about 200 can be grown and planted in Western-Europ and comparable zones of about 7 or higher. A variety with R. catawbiense parentage is usually reliable here, as are the “ironclads.” Chapman’s rhododendron (R. champmanii) is very good for coastal areas. Any flower terminals not pruned will begin growth a bit earlier than the other blooms, and usually do so by growing a long single shoot. Relationships: The rhododendron genus includes plants commonly known as azaleas. Research into the taxonomy of collected specimens proposed that there were in fact two distinct species. Spider mites suck sap from the buds and the undersides of the leaves. Rhododendron macrophyllum, or coast rhododendron, is the state flower of Washington. This is done for several reasons: to keep the plant tidy, prevent the production of seeds, which will save the plant's energy for producing flowers for the following year, and helping in the reduction of diseases and pests. This selection has interesting long recurved leaves and dense fawn indumentum on the underside and lovely wooly young shoots. An … It benefits from staking and is certainly worth growing for it's wonderful foliage. Covered in masses of blue flowers in September in NZ The new variety, with its rosy pink petals and elongated shape, is a hybrid of two species - Rhododendron tuba and Rhododendron praetervisum, bred by Keith Adams in New Plymouth. Deer will do immense damage to rhododendrons, especially when the plants are smaller. a='. 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