Azaleas (/əˈzeɪliə/ə-ZAY-lee-ə) are floweringshrubs in the genusRhododendron, particularly the former sectionsTsutsusi (evergreen) andPentanthera (deciduous). Azaleas bloom in the spring (April and May in the temperate Northern Hemisphere, and October and November in the Southern Hemisphere),[1] their flowers often lasting several weeks. Shade tolerant, they prefer living near or under trees. They are part of the familyEricaceae.
Plant enthusiasts have selectively bred azaleas for hundreds of years. This human selection has produced thousands of differentcultivars which are propagated by cuttings.[2] Azaleaseeds can also be collected andgerminated.
Azaleas are generally slow-growing and do best in well-drained acidic soil (4.5–6.0 pH).[3]Fertilizer needs are low. Some species need regularpruning.
Azaleas are native to several continents including Asia, Europe and North America. They are planted abundantly as ornamentals in the southeastern US, southern Asia, and parts of southwest Europe.[citation needed]
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 plantationMagnolia-on-the-Ashley inCharleston, South Carolina. From Philadelphia, where they were grown only ingreenhouses, John Grimke Drayton (Magnolia's owner) imported the plants for use in his estate garden. With encouragement fromCharles 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 19th century, in late March and early April, thousands visit to see the azaleas bloom in their full glory.[citation needed]
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 toPhytophthora root rot in moist, hot conditions.[5]
Azaleas share the economically important diseasePhytophthora cinnamomi with more than 3000 other plants.[6]: 199
Azaleas share the Azalea lace bug (Stephanitis pyrioides) with many other heath species.[7] Shrewsbury & Raupp 2000 find azaleas can be protected from them bycompanion planting with anoverstory above them.[7]
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In Chinese culture, the azalea is known as "thinking of home bush" (sixiang shu), and is immortalized in the poetry ofDu Fu.
The azalea is also one of the symbols of the city ofSão Paulo,Brazil.[8]
Azaleas and rhododendrons 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.[9]
In addition to being renowned for its beauty, the azalea is also highly toxic—it containsandromedotoxins in both its leaves and nectar, including honey from the nectar.[10] Bees are deliberately fed on Azalea/Rhododendron nectar in some parts of Turkey, producing a mind-altering, potentially medicinal, and occasionally lethal honey known as "mad honey".[11]Azalea is dangerous to pets, as, if consumed, the toxins within the plant tissue can causecentral nervous system depression, which in turn can lead to multi-organ failure. Symptoms may include vomiting, diarrhea, seizures, laryngeal edema and heart rhythm disturbances, which can lead to complete cardiac arrest and therefore death. Acute kidney failure may also occur.[citation needed]
Motoyama, Kōchi has a flower festival in which the blooming of Tsutsuji is celebrated.Tatebayashi, Gunma is famous for its Azalea Hill Park, Tsutsuji-ga-oka.Nezu Shrine inBunkyo, Tokyo, holds a Tsutsuji Matsuri from early April until early May.Higashi Village has hosted an azalea festival each year since 1976. The village's 50,000 azalea plants draw an estimated 60,000 to 80,000 visitors each year.[citation needed]
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Sobaeksan, one of the 12 well-knownSobaek Mountains, lying on the border betweenChungbuk Province andGyeongbuk 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 pinkJeogori (Korean traditional jacket).[12]
The Ma On Shan Azalea Festival is held inMa On Shan, where six native species (Rhododendron championae,Rhododendron farrerae,Rhododendron hongkongense,Rhododendron moulmainense,Rhododendron simiarum andRhododendron simsii[13]) are found in the area. The festival has been held since 2004; it includes activities such as exhibitions, photo contests and carnivals.[14]
Many cities in the United States have festivals in the spring celebrating the blooms of the azalea, includingSummerville, South Carolina;Hamilton, New Jersey;Mobile, Alabama;Jasper, Texas;Tyler, Texas;Norfolk, Virginia;[15]Wilmington, North Carolina (North Carolina Azalea Festival);[16]Valdosta, Georgia;[17]Palatka, Florida (Florida Azalea Festival);[18]Pickens, South Carolina;[19]Muskogee, Oklahoma;Brookings, Oregon; andNixa, Missouri.
The Azalea Trail is a designated path, planted with azaleas in private gardens, throughMobile, Alabama.[20] TheAzalea Trail Run is an annual road running event held there in late March. Mobile, Alabama is also home to theAzalea Trail Maids, fifty women chosen to serve as ambassadors of the city while wearingantebellum dresses, who originally participated in a three-day festival, but now operate throughout the year.[citation needed]
The Azalea Society of America designated Houston, Texas, an "azalea city".[citation needed] The River Oaks Garden Club has conducted the Houston Azalea Trail every spring since 1935.[citation needed]
Valdosta, Georgia is called the Azalea City, as the plant grows in profusion there. The city hosts an annual Azalea Festival in March.
