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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.
Tsutsusi comes from the Japanese word for Azalea, Tsutsuji ( つつじ or ツツジ). When Don (1834) described the subdivisions of Rhododendron he named one of his eight sections, Tsutsutsi (sic), which he explained was the Chinese name of the first species described ( R. indicum , originally Azalea indica L.). [ 8 ]
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.
Depending on the type, evergreen azaleas can bloom from late winter into early fall and provide gorgeous green texture to your garden year round. Here are some of the azaleas we love most. 18 ...
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.
Rhododendron japonicum, the Japanese azalea, is a species of flowering plant in the family Ericaceae, native to Japan. [ 1 ] [ 2 ] A deciduous shrub reaching 8 ft (2.4 m) but usually half that, it is found in grasslands and open scrub, never in dense thickets or woodlands. [ 3 ]
Most are in the United States, with one species found in Canada and one being found in Mexico. North American azaleas are commonly confused with azaleas of Asian origin, the evergreen azaleas. North American azaleas are deciduous and produce two types of buds. One is a larger and produces about 20 flowers while the other bud produces a leafy ...
Rhododendron indicum is an azalea Rhododendron species native to Japan (S & W Honshu, Shikoku, Kyushu, Yakushima). [4] Taxonomy.