Azaleas // are flowering shrubs comprising two of the eight subgenera of the genus Rhododendron: the Tsutsuji (evergreen) and Pentanthera (deciduous). Azaleas bloom in summer in the Northern hemisphere and in winter in the Southern hemisphere, their flowers often lasting several weeks. Shade tolerant, they prefer living near or under trees.
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 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.
Azalea leafy gall can be particularly destructive to azalea leaves during the early spring. Hand picking infected leaves is the recommended method of control.
Cultural significance and symbolism
In Chinese culture, the azalea is known as "thinking of home bush" (sixiang shu) and is immortalized in the poetry of Du Fu and is used to rich effect in contemporary stories such as by Taiwanese author Pai, Hsien-Yung.
In addition to being renowned for its beauty, the Azalea is also highly toxic—it contains andromedotoxins in both its leaves and nectar, including honey from the nectar. The Azalea and Rhododendron were once so infamous for their toxicity that to receive a bouquet of their flowers in a black vase was a well-known death threat.
Motoyama, Kochi also has a flower festival in which the blooming of Tsutsuji is celebrated and Tatebayashi, Gunma is famous for its Azalea Hill Park, Tsutsuji-ga-oka. Nezu Shrine in Bunkyo, Tokyo, holds a Tsutsuji Matsuri from early April until early May.
Sobaeksan, one of the 12 well-known Sobaek Mountains, lying on the border between Chungbuk Province and Gyeongbuk has a Royal Azalea (Rhododendron schlippenbachii) Festival held on May every year. Sobaeksan has an azalea colony dotted around Biro mountaintop, Gukmang and Yonwha early in May. When Royal azaleas have turned pink in the end of May, it looks like Sobaeksan wears a pink Jeogori(Korean traditional jacket). (Information from Dpt. of Culture & Tourism, Danyang-gun County Office)
Many cities in the United States have festivals in the spring celebrating the blooms of the azalea, including Hamilton, NJ; Mobile, Alabama; Jasper, Texas; Norfolk, Virginia; Wilmington, North Carolina (North Carolina Azalea Festival); Valdosta, Georgia; Palatka, Florida (Florida Azalea Festival); Pickens, South Carolina; Muskogee, Oklahoma, Stollysville, Ohio and Brookings, Oregon.
The Azalea Trail is a designated path, planted with azaleas in private gardens, through Mobile, Alabama. The Azalea Trail Run is an annual road running event held there in late March. Mobile, Alabama is also home to the Azalea Trail Maids, fifty women chosen to serve as ambassadors of the city while wearing antebellum dresses, who originally participated in a three-day festival, but now operate throughout the year.
- Clemson University Factsheet
- Benson, D.M. "Azalea Diseases in the Landscape". Plant pathology extension NCSU. North Carolina State University. Retrieved 27 January 2011.
- Municipal law of the city of São Paulo nr. 14472 of 2007.
- "University of Pennsylvania's Poisonous Plants Home Page".
- Norfolk NATO Azalea Festival Website
- North Carolina Azalea Festival Website
- Valdosta, Georgia, Spring Celebration at Callaway Gardens in Pine Mountain, GA, Azalea Festival Website
- Palatka, Florida, Azalea Festival Website
- Pickens' Azalea Festival Website
- "City of Mobile, Azalea Trail Maps".
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