Gerald L. Klingaman
The enormous genus Rhododendron comprises more than a thousand species. They are naturally distributed on every continent except Antarctica, Africa and South America. The highest concentrations of species occur in the temperate and mountainous regions of China, Japan, Korea and Taiwan. Grown for their showy flowers, rhododendrons are garden favorites worldwide and have been highly hybridized. There are more than 28,000 registered cultivars.
Plants in this genus are extremely variable...
Fuzzy leaves are an interesting backdrop to dainty light rose-pink flowers in spring on Rhododendron adenopodum. Found in thickets and on mountain slopes in the highlands of central China, in the Chongquin and Hubei Provinces, this large shrub attains a rounded but spreading shape. It flowers profusely even when a young plant.
The gray barked stems have whorled clusters of elongated medium to light green leaves at branch tips. The leaf is stiff, leathery and covered in tiny gray or tan...
(Admiral Semmes Deciduous Azalea, Deciduous Azalea)
The deciduous azalea ‘Admiral Semmes’ is a hybrid between an Exbury-Knap Hill hybrid azalea ‘Hotspur Yellow’ and the native Florida azalea, Rhododendron austrinum. It has brilliant yellow, fragrant blooms, an upright habit and is heat-tolerant and mildew-resistant. Rhododendron 'Admiral Semmes' was a Georgia Gold Medal winners in 2007 as the year's best shrub.
This azalea has an upright, rounded habit. The leaves are lustrous dark green and hairy and exhibit showy fall color...
One of the so-called Indian hybrid azaleas, this evergreen shrub bears showy clusters of red bell-shaped flowers. The unscented blooms appear from late winter into spring, but may also bloom from late fall through winter in frost-free districts. The compact mounded plants have elliptic dark green leaves.
Hybrids derived from several East Asian species including Rhododendron simsii, R. indicum, and R. murconatum, Indian Group azaleas were first developed...
Bearing showy clusters of large, purple-red, maroon-blotched flowers in spring, 'Afterglow' is one of the more than 400 evergreen azalea hybrids developed from the late 1920s through the 1940s at the United States Department of Agriculture’s Plant Introduction Station at Glenn Dale, Maryland.
Eventually forming an eye-high shrub, this dense upright cultivar has rounded mid-green leaves that go burgundy in fall. The funnel-shaped flowers are held on strong stems and drop after fading rather...
(Aichele Hybrid Azalea)
Developed for greenhouse growing but also doing well in the garden in mild climates, these evergreen azaleas were raised in the 1940s and 1950s at Carolina Flora Nusery in Mt. Holly, South Carolina. Kurume Hybrids figure heavily in their pedigree. They bear showy clusters of red, pink, or white flowers in spring. The funnel-shaped, often ruffled flowers are single or hose-in-hose (with two superimposed sets of petals). The plants are dense and compact.
These somewhat cold-tender azaleas prefer...
(Aida Azalea, Deciduous Azalea, Rustica Azalea)
Rhododendron ‘Aida’ is a spring blooming deciduous azalea. Its large flowers are tubular-funnel-shaped and double hose-in-hose which means it looks like two flowers stacked. The color is bright pink with a rose throat and dark spots. The foliage is medium green.
These azaleas have upright, rounded and open habits. The leaves are green, hairy and exhibit showy fall color in shades of yellow, orange and red. The colorful flowers appear before the foliage. Clusters of blooms emerge near...
(Aikoku Azalea, Evergreen Azalea, Satsuki Azalea)
Satsuki hybrid azaleas are evergreen shrubs prized for their large flowers and low compact habit. These have been extensively cultivated in Japan for over 300 years and are frequently used as specimen plants in traditional Japanese gardens and for bonsai.
The cultivar ‘Aikoku’ produces large, white, star-like flowers lined with bright pink and flecked with red. These generally appear in mid to late spring.
Most azaleas prefer part sun to shade and thrive in well drained, organic rich soil....
(Alaska Hybrid Azalea, Hybrid Azalea, Rutherford Hybrid Azalea)
One of the Rutherford Hybrid azaleas, this evergreen shrub bears showy clusters of ruffled white flowers from early to mid-spring. It may also bloom in fall and winter in frost-free climates. The single or double, funnel-shaped blooms have a yellow-green blotch on their upper lobes. The compact mounded plants have elliptic dark green leaves.
Tracing their ancestry to the Kurume Hybrids as well as to several East Asian species including Rhododendron simsii, R. indicum,...
(Amagasa Azalea, Evergreen Azalea, Satsuki Azalea)
Satsuki hybrid azaleas are evergreen shrubs prized for their large flowers and low compact habit. They have been extensively cultivated in Japan for over 300 years and are frequently used as specimen plants in traditional Japanese gardens and for bonsai.
The cultivar 'Amagasa' is a heavy bloomer that produces large, dark coral pink, star-shaped flowers flecked with red. These generally appear in mid to late spring.
Most azaleas prefer part sun to shade and thrive in well drained, organic...