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Rhododendron arborescens, also known as smooth azalea [1] or sweet azalea, is a species of flowering plant in the family Ericaceae, native to the eastern seaboard of the United States. It grows to a height of 2.4–3 metres (8–10 ft). Generally blooming in late spring and early summer, the flowers range in color from white to pink with red ...
Rhododendron atlanticum. Rhododendron atlanticum, the dwarf azalea, grows on the coastal plain from Georgia to Delaware. It can be found up to 200 miles away from the coast, if the region is sandy, swampy, or dry. These plants can spread by rhizomes if the soil is loose. The flowers can be white or a light pink color, and are fragrant.
Two subgenera are generally known to gardeners as "Azaleas", and include many fewer true species: Pentanthera, which comprises the deciduous azaleas, and Tsutsusi, which includes evergreen azaleas. [3] Modern cladistic analysis, based on nuclear genetics, proposes changes in the classification of species within subgenera.
Azalea leafy gall can be particularly destructive to azalea leaves during the early spring. Hand picking infected leaves is the recommended method of control. [4] They can also be subject to Phytophthora root rot in moist, hot conditions. [5] Azaleas share the economically important disease Phytophthora cinnamomi with more than 3000 other plants.
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The following is a list of rhododendron cultivars and species which have gained the Royal Horticultural Society's Award of Garden Merit.They are mostly hardy evergreen shrubs with abundant, brilliantly-coloured, trumpet-shaped flowers, often in large spherical trusses.
Sweet. Rhododendron canescens, the piedmont azalea or mountain azalea, or wild azalea, or native azalea, or dead man’s handkerchief is a pink-blooming azalea native ...
Rhododendron vaseyi, the pinkshell azalea, [4] is a species of flowering plant in the heath family Ericaceae.It is endemic to the Appalachian highlands of North Carolina.The specific epithet vaseyi honors the American plant collector George Richard Vasey and his father Dr. George Vasey, Chief Botanist at the United States Department of Agriculture from 1872 to 1893.