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Some azaleas are deciduous and lose all their leaves in the fall but losing some leaves is natural for evergreen varieties. However, dried leaves clinging to the stems are a sign of winter damage ...
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 ...
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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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Dwarf azalea is a common name for several species of Rhododendron: Rhododendron atlanticum, native to the eastern United States; Rhododendron kiusianum, native to Japan; Rhododendron minus, the Piedmont Rhododendron; Rhododendron nakaharai, native to Taiwan
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.
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