Plant List of 1992 Rhododendron Exhibit

Rhododendron 'Manitou'
Picture by S & J Perkins
Rhododendron 'Manitou' growing in Salem, NH

Apricot Pink - An Rh. maximum hybrid, its habit is somewhat more compact and manageable than its parent. Flowers are rosy pink with a hint of apricot in generous trusses. Hardy to at least -15 F and needs sun for best performance.

Bali - This compact growing rhododendron gets its hardiness from its parent, Rh. catawbiense. Bearing loose trusses of light pink flowers with strong yellow overtones, this plant needs good light to keep its good habit and floriferousness. Hardy to -20 F.

Balta - A hybrid of Rh. minus, a small-leafed southern species, this plant is much like PJM in habit and hardiness, but with much lighter pink flowers. In full sun, its flowers can fade to almost white.

Baroness Schroeder - An Rh. catawbiense hybrid, this is a ruffled, very pale pink with a dark blotch, in tall trusses. Hardy to only -10 F, and even in full sun has a tendency to legginess.

Boule de Neige - An antique cultivar dating from 1878, this cross of Rh. caucasicum (a European species) with an Rh. catawbiense hybrid has inherited the best virtues of both parents. Combining the hardy, healthy adaptability of the American parent with the very compact growth and snow white flowers of its European parent. Hardy to -25 F, this vigorous variety will do well in either sun or part shade.

Calsap - An eye-catching flower of pure white with a large purple-black blotch, this shrub needs plenty of sun to keep a good habit. Inherits hardiness from its parent Rh. catawbiense, to at least -25 F.

Dora Amateis - A cross of Rh. carolinianum, this low-growing plant will stay dense and compact even in full shade. Multiple buds open pink and fade to pure white. On a well-grown plant they can be so plentiful they can literally weight the plant down. Although it is hardy to -15 F, it must be situated out of strong winds and harsh exposures.

English Roseum - A tough hybrid of Rh. catawbiense, this antique variety is probably the most common variety grown in the Boston area. Hardy to at least -25F, it is also heat and drought tolerant, as well as disease resistant. Rosy pink flowers with a hint of magenta.

Francesca - A tall, upright, open-growing plant, this hybrid needs shade to protect its heavy trusses of very dark red flowers from damage from the sun. Hardy to at least -10F. Site this where the late afternoon sun will catch the flowers for a visual treat in the woodland garden.

Homebush - A deciduous azalea with an upright habit, hardy to at least -15 F. The flowers are vivid pink and semi-double, packed into nearly round balls of bloom that look, from a little distance, like pink pompoms

Hong Kong - A large growing hybrid of Rh. catawbiense, hardy to -20 F, this variety carries open trusses of very light yellow flowers.

Leets Dark Purple - This handsome, large-growing plant will stand full sun and exposure, but the light purple flowers will fade in strong sunshine. A hybrid of Rh. catawbiense, it is hardy to at least -15 F.

Malta - This small-leaved hybrid bears light pink flowers in early mid-season. A resilient plant, hardy to -25 F, good for sunny, exposed position.

Manitau - This extremely floriferous small-leafed hybrid of Rh. carolinianum will form a dense semi-dwarf plant, as broad as tall, and performs best in full sun. Large clusters of small pink and white flowers can completely hide the foliage. Hardy to at least -20 F.

Merley Cream- A large-growing plant with white flowers with a prominent yellow-green flare, this Dexter hybrid undoubtedly gets its hardiness from Rh. catawbiense. Hardy to -20 F.

Milestone - An upright, twiggy shrub, nearly deciduous in winter, flowering in mid-April with dark pink, almost red, flowers. Hardy to at least -10 F, does best in full sun.

Mollv Fordham - A compact PJM type, with pink buds fading to near white flowers. Very floriferous, does best in full sun. Rh. carolinianum lineage.

Nova Zembla -. Hardy to -25 F, this Rh. catawbiense hybrid is the most common red variety in the Boston area. Tall growing but dense, it carries distinctive dark green twisted foliage. Sun and heat tolerant, this one also needs extra good drainage.

Pauline Bralitt - A dense, compact hybrid of Rh. catawbiense with handsome rounded foliage, this variety can nevertheless get large with age. Deep rosy pink buds open to fragrant white flowers. Deep green leaf color is kept even in full sun. Hardy to at least -10 F.

Peach Abbott - A deciduous azalea hybrid of Rh. prinophvllum with masses of rich peach-pink, fragrant flowers. Hardy to at least -25 F.

Pink Butterflies - A large growing Rh. maximum hybrid of unknown origin, it carries pink trusses in late June. Hardy to at least -15 F.

Pink Twins - An early Rh. catawbiense hybrid of Joseph Gable, this variety often will grow twice as broad as tall. The light rich pink flowers have an enlarged colored calyx so that they look double. Needs lots of sun to set flower buds. Hardy to -15 F.

Rio - Light pink flowers with a yellow throat in large trusses on a compact plant. Sometimes difficult to site: needs sun to keep its habit, but shade from the hot sun to protect the delicate color. A combination of Rh. catawbiense and Rh. fortunei, it is hardy to about -20 F.

Rh. austrinum 'Flame' - A selection of a species native to Georgia and Florida, this carries fragrant yellow flowers with very long corolla tubes in late May. Hardy only in the mildest parts of New England.

Rh. canescens 'Brooke' - The "Piedmont Azalea" is a widespread species native to nearly all the southern states from the coastal plains of North Carolina, south and west to north Texas and Arkansas. This selection has deep pink fragrant flowers with creamy-yellow overtones. Hardy only in the mildest parts of New England.

Rh. carolinianum - One of the two most important native species in the hybridization of evergreen rhododendrons, this is nevertheless a fine ornamental plant in its own right. A large-growing, rounded shrub bearing plentiful light pink flowers, hardy to at least -20 F. Needs full sun and good drainage for best results. Often has remarkable winter foliage color. A parent of the ever-popular PJM.

Rh. catawbiense - The other most important native species in the hybridization of evergreen rhododendrons, the true species, so plentiful in our mountains, is nearly unobtainable in nurseries today. A large shrub, to 15 feet with age, hardy to -25 F, in shades of rosy pink, although selections of pure white and near red have been made from the wild.

Catawbiense Album - An antique variety from before 1900, this superior hybrid has stood the test of time. Vigorous, hardy (to at least -25 F) and floriferous, its main fault in a modern setting is its ability to grow very large very fast. Needs sun to stay dense, but will flower well even in shade.

Catawbiense GrandifIorum - Another antique variety, with lilac flowers. Although it will grow as large, and is as hardy as the preceding variety, its habit, foliage and truss are inferior.

Rh. maximum - A very large growing species, sometimes called a small tree, native to the entire Appalachian Mountain chain from Georgia to New Hampshire. Very vigorous, hardy (to -30 F) and floriferous. Nearly indestructible in heat or drought. Small pink, or rarely white, flowers, borne in late June.

Rh. periclymenoides - The Pinxterbloom Azalea is native to most of the Appalachians as far north as Massachusetts. Its habit is generally broader than tall, with plenty of fragrant light pink flowers. Does well even in shade. Hardy to -25 F.

Rh. prinophyllum - One of our hardiest native azaleas, it also has one of the widest distributions, from southern Quebec through New England, south in the Appalachians to Virginia and west to Oklahoma and Indiana. It is the parent of the Northern Lights series of hybrid azaleas from the University of Minnesota. A large spreading shrub with pink to purplish-pink flowers with a distinctive clove fragrance.

Rh. vaseyi - The Pinkshell Azalea is native to the mountains of South Carolina, but is very hardy, to -15 F. Its habit is tall and rounded to 10 feet with age in the Boston area. Flowers have a distinctive spread-eagled butterfly shape, in shades of pink. Early, blooms in April.

Rh. vaseyi "White Find" - A pure white selection of the species, with somewhat smaller flowers.

Rosy Lights - A deciduous azalea from Rh. prinophyllum, this hybrid was developed by the University of Minnesota for its hardiness, tested down to -40 F! Pink, fragrant flowers on a medium-sized, round-headed shrub make this a popular choice for difficult climates.

The General - From Rh. catawbiense, this hybrid has crimson flowers with a dark blotch. Plant habit is large with good foliage and very hardy, to at least -20 F.

Tottenham - This very dense-growing plant carries the thrifty qualities of Rh. carolinianum to a dwarf plant good for foundation plantings, beds near walkways, or anywhere a well-behaved habit is needed. Hardy to -20 F, it bears small trusses of pink flowers in mid-season. Blooms best in full sun, and keeps its beautiful rounded pillow shape without the need of pruning.

Trojan Warrior - Formerly known as Early Red or Bright Red, is probably a hybrid of Nova Zembla from which it has inherited the slightly reflexed or twisted leaves. A large-leaved hybrid becoming a large plant with compact growth habit, flowers a purple red, it is hardy to -15 F. This is a new registration this year by Weston Nurseries of Hopkinton, Massachusetts.

Walter Hunnewell - Also a catawbiense hybrid, this is an unusual bi-color, with a white center and rose edging to the flower. Hardy to almost -l0 F.

White Lights - Another of the very hardy Northern Lights series, this has been tested down to -45 F! White, fragrant flowers on a large, upright, round-headed shrub.

Windbeam - A very fine cross of Rh. carolinianum with the Himalayan species Rh. racemosum. Dense and floriferous and very reliable, this shrub carries multiple bunches of apple blossom pink-and-white frilled flowers on an upright shrub. One or the easiest rhododendrons to prune. Hardy to at least -25 F. Best with at least one-half day of sun.

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