Auburn University Horticulture Department, Auburn, AL
(Evergreen Azalea, Robin Hill Azalea)
Robin Hill hybrid azaleas are a large group of evergreen shrubs that were hybridized in New Jersey by chemist and rhododendron enthusiast, Robert Gartrell. They are complex hybrids which combine the attributes of small-flowered hardy azaleas with those of the more tender large-flowered types. Generally, they are compact, spreading or mounding, have an extended blooming season and bear large flowers on small plants.
This large group of azaleas is quite cold tolerant. Their leaves are generally...
Gerald L. Klingaman
(Evergreen Azalea, Marian Lee Azalea, Morrison Hybrid Azalea)
Hybridized by B. Y. Morrison, who also developed most of the Glenn Dale Hybrids, this compact evergreen azalea bears showy few-flowered clusters of large pinkish-white to strong pink blooms with bright red rims. The flaring, funnel-shaped flowers appear from mid- to late spring. This broad chest-high shrub has elliptic shiny medium-green leaves.
B. Y. Morrison continued developing evergreen azalea cultivars following his retirement from the United States Department of Agriculture and his subsequent...
David C. Royster
(Hybrid Azalea, Martha Hitchcock Hybrid Azalea)
Bearing showy clusters of large white flowers with broad rose-lavender rims, 'Martha Hitchcock' is one of the more than 400 named 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. The flaring funnel-shaped blooms appear in mid-spring. The spent flowers drop rather than persisting on the plant. This upright, open, chest-high shrub has elliptic medium- to dark-green leaves.
Flowering in fruity tropical colors that belie its excellent cold-hardiness, this Gable Hybrid bears showy domed heads of large flowers that open soft salmon pink and age to lemony-peach. The ruffled, funnel-shaped, red-throated blooms are of heavy substance. They open in mid-spring. This dense, rounded, head-high shrub has large elliptic light green leaves which are often somewhat twisted.
This is one of several large-leaved rhododendron hybrids developed by Joseph Gable of Stewartstown,...
(Gable Hybrid Rhododendron, Maxecat Rhododendron, Rhododendron)
Product of a cross between the eastern North American natives Rhododendron maximum and R. catawbiense, this exceptionally hardy and highly ornamental Gable Hybrid bears showy conical heads of light purplish pink flowers with darker pink margins in late spring. The flaring, funnel-shaped blooms have a golden blotch and red spotting on their upper lobes. This dense, rounded, medium-sized shrub has long dark green leaves that are somewhat glossy. Its red twigs are also ornamental....
(Evergreen Azalea, Merlin Evergreen Azalea)
Displaying showy clusters of large, lilac-purple, maroon-flecked blooms from mid- to late spring, 'Merlin' 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, upright and spreading shrub, this vigorous cultivar has narrow matte green leaves. The funnel-shaped flowers are held on strong stems and drop after fading...
(Michael Waterer Rhododendron, Rhododendron)
Well over a century old and still well worth planting, this cold-hardy, profusely blooming Waterer Hybrid bears spherical clusters of magenta-red flowers from mid- to late spring. The wide-flaring, funnel-shaped blooms fade to rosy crimson as they age. This dense rounded slow-growing shrub has large, elliptic, medium-green leaves.
One of the horticultural dynasties of nineteenth and twentieth century England, the Waterer family introduced a diversity of large-leaved rhododendrons through their...
David C. Royster
Large white semi-double or single flowers with purple-pink edges ornament the compact upright branches of this evergreen azalea in mid-spring. A few solid pink flowers also occur. The ruffled funnel shaped blooms are prolifically borne in few-flowered clusters. The narrow oval leaves are glossy green. This cultivar grows slowly into a dense rounded shrub.
Prized for their large flowers and compact habit, Satsuki Azaleas descend from Rhododendron indicum, Rhododendron eriocarpum,...
(Dwarf Rhododendron, Moerheim Rhododendron)
Valued for its bright early blooms, its low mounded habit, and its handsome evergreen leaves, this hybrid of Rhododendron impeditum bears showy clusters of lilac-violet flowers from early to mid-spring. This dense waist-high shrub has small elliptic glossy green leaves that turn burgundy in cold weather.
Like most rhododendrons, 'Moerheim' favors chilly winters, moderate summers, and highly organic, well-drained, acidic soil. It departs from the norm, however, in preferring light shade...
(Deciduous Azalea, Exbury Hybrid Azalea, Molalla Red Azalea)
Showy spherical clusters of large intense red flowers adorn this deciduous azalea in late spring, before the foliage has fully emerged. The broadly funnel-shaped flowers have ruffled petals. This wide upright medium-sized shrub has slightly wrinkled elliptic leaves that turn bronze and burgundy tones in fall. It is one of many deciduous azaleas hybridized by Ivan and Robertha Arneson of Portland, Oregon, using Knap Hill/Exbury Hybrids and other azalea hybrids and species.
Azaleas prefer sites...