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Azaleas are flowering shrubs in the genus ''Rhododendron'', particularly the former sections ''Tsutsuji'' (evergreen) and ''Pentanthera'' (deciduous). Azaleas bloom in spring, their flowers often lasting several weeks. Shade tolerant, they prefer living near or under trees. They are part of the Ericaceae family. ==Cultivation== Plant enthusiasts have selectively bred azaleas for hundreds of years. This human selection has produced over 10,000 different cultivars which are propagated by cuttings. Azalea seeds can also be collected and germinated. Azaleas are generally slow-growing and do best in well-drained acidic soil (4.5–6.0 pH).〔(Clemson University Factsheet )〕 Fertilizer needs are low; some species need regular pruning. Azaleas are native to several continents including Asia, Europe and North America. They are planted abundantly as ornamentals in the southeastern USA, southern Asia,and parts of southwest Europe. According to azalea historian Fred Galle, in the United States, ''Azalea indica'' (in this case, the group of plants called Southern indicas) was first introduced to the outdoor landscape in the 1830s at the rice plantation Magnolia-on-the-Ashley in Charleston, South Carolina. Magnolia's owner John Grimke Drayton imported the plants for use in his estate garden from Philadelphia, where they were grown only in greenhouses. With encouragement from Charles Sprague Sargent from Harvard's Arnold Arboretum, Magnolia Gardens was opened to the public in 1871, following the American Civil War. Magnolia is one of the oldest public gardens in America. Since the late nineteenth century, in late March and early April, thousands visit to see the azaleas bloom in their full glory. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「azalea」の詳細全文を読む スポンサード リンク
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