Azalea

azaleasJapanese azaleaMountain Azalea Japanese azaleaKobano-mitsuba-tsutsujiRhododendron obtusumSatsuki azaleaTanashi Azaleawild azalea
Azaleas are flowering shrubs in the genus Rhododendron, particularly the former sections Tsutsuji (evergreen) and Pentanthera (deciduous).wikipedia
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Rhododendron

rhododendronsAzaleaDwarf azalea
Azaleas are flowering shrubs in the genus Rhododendron, particularly the former sections Tsutsuji (evergreen) and Pentanthera (deciduous).
Azaleas make up two subgenera of Rhododendron.

Rhododendron sect. Tsutsusi

TsutsusiTsutsuji
Azaleas are flowering shrubs in the genus Rhododendron, particularly the former sections Tsutsuji (evergreen) and Pentanthera (deciduous).
Rhododendron section Tsutsusi (spelled Tsutsuji in some older texts) was a subgenus of the genus Rhododendron, commonly referred to as the evergreen azaleas.

Cultivar

cultivarsvarietycultivated variety
This human selection has produced over 10,000 different cultivars which are propagated by cuttings.
Popular ornamental garden plants like roses, camellias, daffodils, rhododendrons, and azaleas are cultivars produced by careful breeding and selection for floral colour and form.

Ericaceae

heatherheath familyericaceous
They are part of the family Ericaceae.
The many well-known and economically important members of the Ericaceae include the cranberry, blueberry, huckleberry, rhododendron (including azaleas), and various common heaths and heathers (Erica, Cassiope, Daboecia, and Calluna for example).

Rhododendron subg. Pentanthera

Pentanthera
Azaleas are flowering shrubs in the genus Rhododendron, particularly the former sections Tsutsuji (evergreen) and Pentanthera (deciduous).
The common name azalea is applied to many of the species, and also to species in some other subgenera.

Phytophthora

crown rotdiebackink disease
They can also be subject to phytophthora root rot in moist, hot conditions.
Phytophthora cinnamomi—causes cinnamon root rot affecting forest and fruit trees, and woody ornamentals including arborvitaee, azalea, Chamaecyparis, dogwood, forsythia, Fraser fir, hemlock, Japanese holly, juniper, Pieris, rhododendron, Taxus, white pine, American chestnut and Australian woody plants, especially eucalypt and banksia.

Shrub

shrubssubshrubbushes
Azaleas are flowering shrubs in the genus Rhododendron, particularly the former sections Tsutsuji (evergreen) and Pentanthera (deciduous).
Rhododendron (Rhododendron, Azalea) *

Motoyama, Kōchi

Motoyama
Motoyama, Kōchi 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.
A festival which welcomes the coming of spring along with the blooming of various flowers. Cherry blossoms and Tsutsuji (azalea) can be seen in the central area of Motoyama, while the highlight of the festival can be seen at the nearby Kizenzan Park where over 30,000 Shakunage (rhododendron) are displayed.

Nezu Shrine

Nezu Shrine in Bunkyo, Tokyo, holds a Tsutsuji Matsuri from early April until early May.
It is famous for its Azalea Festival (Tsutsuji Matsuri) which is held on its grounds from early April until early May, and it has been described as "Tokyo’s most beautiful shrine" and as one the city's "most spectacular spring scenes".

Ma On Shan (town)

Ma On ShanMa On Shan New TownMa On Shan Town Centre
The Ma On Shan Azalea Festival is held in Ma On Shan, where six native species (Rhododendron championae, Rhododendron farrerae, Rhododendron hongkongense, Rhododendron moulmainense, Rhododendron simiarum and Rhododendron simsii ) are found in the area.
2. Azaleas: The azalea species Rhododendron hongkongense was discovered in Hong Kong in 1851 but was mistaken for another, only acquiring its "Hongkong" name in 1930.

Pruning

prunedprunecut back
Some species need regular pruning.
Forsythia, azaleas and lilacs all fall into this category.

Valdosta, Georgia

ValdostaValdosta, GAGeorgia (Valdosta)
Many cities in the United States have festivals in the spring celebrating the blooms of the azalea, including Summerville, South Carolina; Hamilton, NJ; Mobile, Alabama; Jasper, Texas; Tyler, Texas; Norfolk, Virginia; Wilmington, North Carolina (North Carolina Azalea Festival); Valdosta, Georgia; Palatka, Florida (Florida Azalea Festival); Pickens, South Carolina; Muskogee, Oklahoma; Brookings, Oregon; and Nixa, Missouri.
The city hosts an annual Azalea Festival in March.

Tyler, Texas

TylerTyler, TX Tyler
Many cities in the United States have festivals in the spring celebrating the blooms of the azalea, including Summerville, South Carolina; Hamilton, NJ; Mobile, Alabama; Jasper, Texas; Tyler, Texas; Norfolk, Virginia; Wilmington, North Carolina (North Carolina Azalea Festival); Valdosta, Georgia; Palatka, Florida (Florida Azalea Festival); Pickens, South Carolina; Muskogee, Oklahoma; Brookings, Oregon; and Nixa, Missouri.
The United States Postal Service operates several post offices in Tyler, including Tyler, Azalea, Southeast Crossing, and the South Tyler Annex.

Muskogee, Oklahoma

MuskogeeMuskogee, OKMuskogee, Indian Territory
Many cities in the United States have festivals in the spring celebrating the blooms of the azalea, including Summerville, South Carolina; Hamilton, NJ; Mobile, Alabama; Jasper, Texas; Tyler, Texas; Norfolk, Virginia; Wilmington, North Carolina (North Carolina Azalea Festival); Valdosta, Georgia; Palatka, Florida (Florida Azalea Festival); Pickens, South Carolina; Muskogee, Oklahoma; Brookings, Oregon; and Nixa, Missouri.
Muskogee is home to Honor Heights Park, a World War I memorial park, notable for its azaleas and the annual Azalea Festival held each April.

Tatebayashi, Gunma

TatebayashiTatebayashi City
Motoyama, Kōchi 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.

Florida Azalea Festival

Many cities in the United States have festivals in the spring celebrating the blooms of the azalea, including Summerville, South Carolina; Hamilton, NJ; Mobile, Alabama; Jasper, Texas; Tyler, Texas; Norfolk, Virginia; Wilmington, North Carolina (North Carolina Azalea Festival); Valdosta, Georgia; Palatka, Florida (Florida Azalea Festival); Pickens, South Carolina; Muskogee, Oklahoma; Brookings, Oregon; and Nixa, Missouri.
The festival celebrates the seasonal arrival of the azalea blossom to the northeast Florida region.

List of Award of Garden Merit rhododendrons

Award of Garden Merit rhododendron
List of Award of Garden Merit rhododendrons
The group known as azaleas are often (but not always) more compact with smaller flowers and leaves, and may be evergreen (subgenus Tsutsuji) or deciduous (subgenus Pentanthera). Most rhododendrons bloom for a short period in late spring (April to May in the temperate Northern Hemisphere).

Bunkyō

BunkyoBunkyo-kuBunkyō Ward
Nezu Shrine in Bunkyo, Tokyo, holds a Tsutsuji Matsuri from early April until early May.

Azalea Trail Maids

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.
The trail traces its beginnings to an effort by the Mobile Junior Chamber of Commerce during the 1920s that saw the planting of azaleas along the city's streets.

Seed

seedsseed coatkernel
Azalea seeds can also be collected and germinated.

Germination

germinategerminatinggerminates
Azalea seeds can also be collected and germinated.

Fertilizer

fertiliserfertilizersnitrogen fertilizer
Fertilizer needs are low.

Charleston, South Carolina

CharlestonCharleston, SCCharles Town
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.

Greenhouse

greenhousesalpine houseglasshouses
From Philadelphia, where they were grown only in greenhouses, John Grimke Drayton (Magnolia's owner) imported the plants for use in his estate garden.

Charles Sprague Sargent

Sarg.SargentC. S. Sargent
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.