The following is a list of rhododendron cultivars and species which have gained the Royal Horticultural Society's Award of Garden Merit. They are mostly hardy evergreen shrubs with abundant, brilliantly-coloured, trumpet-shaped flowers, often in large spherical trusses. 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). They are seen at their best in a woodland setting with light dappled shade, in humus-rich acid soil. [1]
Maximum dimensions are shown in metres.
name | species | type | colour | Height | Spread |
---|---|---|---|---|---|
R. arborescens [2] | white/pink | 4.0 | 4.0 | ||
R. bureavii [3] | pink/white | 2.5 | 2.5 | ||
R. calophytum [4] | pink (pale) | 8.0 | 8.0 | ||
R. davidsonianum [5] | pink (pale) | 4.0 | 2.5 | ||
R. decorum [6] | white | 8.0 | 2.5 | ||
R. falconeri [7] | white | 12.0 | 4.0 | ||
R. fulvum [8] | pink | 4.0 | 4.0 | ||
R. luteum [9] | deciduous azalea | yellow | 4.0 | 4.0 | |
R. macabeanum [10] | yellow | 12.0 | 12.0 | ||
R. makinoi [11] | pink | 2.5 | 2.5 | ||
R. orbiculare [12] | pink (rose) | 2.5 | 2.5 | ||
R. pachysanthum [13] | pink (pale) | 1.5 | 2.5 | ||
R. pseudochrysanthum [14] | pink (pale) | 2.5 | 2.5 | ||
R. racemosum [15] | white/pink | 2.5 | 2.5 | ||
R. rex [16] | white (cream) | 12.0 | 8.0 | ||
R. rex subsp. fictolacteum [17] | white (cream) | 12.0 | 8.0 | ||
R. rex subsp. rex [18] | white or pink | 12.0 | 8.0 | ||
R. sinogrande [19] | yellow | 12.0 | 8.0 | ||
R. viscosum [20] | white/pink | 2.5 | 2.5 | ||
R. williamsianum [21] | pink (rose) | 1.5 | 1.5 | ||
'Albert Schweitzer' [22] | pink (pale) | 4.0 | 2.5 | ||
'Alexander' [23] | evergreen azalea | orange | 0.5 | 0.5 | |
'Alice' [24] | rose pink | 2.5 | 2.5 | ||
'Bashful' [25] | pink (pale) | 1.5 | 1.5 | ||
'Berryrose' [26] | deciduous azalea | salmon pink | 2.5 | 1.5 | |
'Blaauw's Pink' [27] | evergreen azalea | salmon pink | 1.0 | 1.0 | |
'Blewbury' [28] | white | 1.5 | 1.5 | ||
'Blue Danube' [29] | evergreen azalea | blue (violet) | 2.5 | 1.5 | |
'Blue Peter' [30] | blue (violet) | 2.5 | 2.5 | ||
'Bouquet de Flore' [31] | deciduous azalea | pink/yellow | 2.5 | 1.5 | |
'Canzonetta' [32] | evergreen azalea | rose pink | 1.0 | 1.0 | |
'Cecile' [33] | deciduous azalea | salmon pink/yellow | 2.5 | 2.5 | |
'Chinese Silver' [34] | R. argyrophyllum subsp. nankingense | pink | 4.0 | 2.5 | |
'Cilpinense' [35] | pink (pale) | 1.1 | 1.1 | ||
'Cornell Pink' [36] | R. mucronulatum | deciduous | pink (pale) | 2.5 | 1.5 |
'Crane' [37] | white | 1.0 | 1.0 | ||
'Crest' [38] | yellow (pale) | 4.0 | 4.0 | ||
'Curlew' [39] | yellow (pale) | 0.5 | 0.5 | ||
'Cynthia' [40] | rose-pink | 8.0 | 8.0 | ||
'Daviesii' [41] | deciduous azalea | white/yellow | 1.5 | 1.5 | |
'Dopey' [42] | red (crimson) | 2.5 | 2.5 | ||
'Dora Amateis' [43] | white | 1.0 | 1.0 | ||
'Dreamland' [44] | pink (pale) | 1.5 | 1.0 | ||
'Egret' [45] | white | 0.5 | 1.0 | ||
'Elisabeth Hobbie' [46] | red (crimson) | 0.8 | 0.8 | ||
'Elsie Lee' [47] | purple | 1.0 | 1.0 | ||
'Fabia' [48] | orange/pink | 2.5 | 2.5 | ||
'Faggeter's Favourite' [49] | white/pink | 2.5 | 2.5 | ||
'Fantastica' [50] | red/white | 1.0 | 1.0 | ||
'Fastuosum Flore Pleno' [51] | blue | 4.0 | 4.0 | ||
'Fireball' [52] | deciduous azalea | red (scarlet) | 2.5 | 2.5 | |
'Furnivall's Daughter' [53] | pink/maroon | 4.0 | 4.0 | ||
'Gartendirektor Rieger' [54] | pink (pale) | 1.5 | 1.5 | ||
'Gibraltar' [55] | deciduous azalea | yellow/red | 1.5 | 1.5 | |
'Ginny Gee' [56] | pink (pale) | 0.5 | 1.0 | ||
'Golden Torch' [57] | yellow (pale) | 1.5 | 1.5 | ||
'Goldkrone' [58] | yellow | 1.5 | 1.5 | ||
'Gomer Waterer' [59] | pink/yellow | 2.5 | 2.5 | ||
'Gristede' [60] | blue | 1.0 | 1.0 | ||
'Hachmann's Marlis' [61] | pink (rose) | 1.5 | 1.5 | ||
'Hachmann's Polaris' [62] | pink (purple) | 1.5 | 1.5 | ||
'Hachmann's Porzellan' [63] | white/yellow/green | 1.5 | 1.5 | ||
'Hino-crimson' [64] | evergreen azalea | crimson | 0.5 | 0.5 | |
'Hinomayo' [65] | pink (pale) | 1.0 | 1.0 | ||
'Homebush' [66] | deciduous azalea | pink | 1.5 | 1.5 | |
'Hotspur Red' [67] | deciduous azalea | red (scarlet) | 1.5 | 1.5 | |
'Hydon Dawn' [68] | pink (pale) | 1.5 | 1.5 | ||
'Hydon Hunter' [69] | pink (rose) | 1.5 | 1.5 | ||
'Johanna' [70] | evergreen azalea | red (carmine) | 1.0 | 1.0 | |
'Kate Waterer' [71] | pink (rose) | 2.5 | 2.5 | ||
'Klondyke' [72] | deciduous azalea | orange/yellow | 2.5 | 2.5 | |
'Kluis Sensation' [73] | red (scarlet) | 2.5 | 2.5 | ||
'Koichiro Wada' [74] | R. yakushimanum | pink/white | 1.5 | 1.5 | |
'Lady Clementine Mitford' [75] | pink (peach) | 2.5 | 2.5 | ||
'Lavender Girl' [76] | pink (mauve) | 2.5 | 2.5 | ||
'Lem's Cameo' [77] | pink/red | 2.5 | 2.5 | ||
'Lem's Monarch' [78] | pink/white | 2.5 | 2.5 | ||
'Loderi King George' [79] | pink (pale) | 4.0 | 4.0 | ||
'Loderi Pink Diamond' [80] | pink (pale) | 4.0 | 4.0 | ||
'Loder's White' [81] | white | 2.5 | 2.5 | ||
'Lord Roberts' [82] | red (crimson) | 2.5 | 2.5 | ||
'Markeeta's Prize' [83] | red (scarlet) | 2.5 | 2.5 | ||
'Merganser' [84] | yellow (primrose) | 1.0 | 1.0 | ||
'Mid-winter' [85] | R. dauricum | purple | 1.5 | 1.5 | |
'Moerheim' [86] | blue (violet) | 1.0 | 1.0 | ||
'Mother's Day' [87] | evergreen azalea | red (crimson) | 0.7 | 0.7 | |
'Mrs A.T. de la Mare' [88] | white | 2.5 | 2.5 | ||
'Mrs Charles E. Pearson' [89] | pink (pale) | 4.0 | 2.5 | ||
'Mrs Furnivall' [90] | pink (rose) | 2.5 | 2.5 | ||
'Mrs T.H. Lowinsky' [91] | white/orange | 2.5 | 2.5 | ||
'Myrtilloides Group' [92] | R. campylogynum | lavender pink | 0.5 | 0.5 | |
'Nancy Evans' [93] | yellow | 1.5 | 1.5 | ||
'Nancy Waterer' [94] | yellow | 2.5 | 2.5 | ||
'Narcissiflorum' [95] | deciduous azalea | yellow | 2.5 | 2.5 | |
'Niagara' [96] | evergreen azalea | white | 0.6 | 0.6 | |
'Olga' [97] | yellow/pink | 1.5 | 1.5 | ||
'Openwood' [98] | R. yunnanense | semi-evergreen | pink (pale) | 8.0 | 4.0 |
'Palestrina' [99] | evergreen azalea | white | 1.5 | 1.0 | |
'Panda' [100] | yellow/pink | 1.5 | 1.5 | ||
'Patty Bee' [101] | yellow (pale) | 1.0 | 1.0 | ||
'Penheale Blue' [102] | yellow (pale) | 1.0 | 1.0 | ||
'Percy Wiseman' [103] | white (cream) | 2.5 | 2.5 | ||
'Persil' [104] | deciduous azalea | white/yellow | 2.5 | 1.5 | |
'Pink Cherub' [105] | pink | 1.5 | 1.5 | ||
'Pink Pancake' [106] | pink (salmon) | 0.5 | 1.5 | ||
'Praecox' [107] | pink (rose) | 1.5 | 1.5 | ||
'Princess Anne' [108] | yellow (pale) | 1.0 | 1.0 | ||
'Ptarmigan' [109] | white | 0.9 | 0.9 | ||
'Ramapo' [110] | purple (violet) | 1.0 | 1.0 | ||
'Razorbill' [111] | pink (rose) | 1.5 | 1.5 | ||
'Renoir' [112] | pink (rose) | 1.5 | 1.5 | ||
'Rock Rose' [113] | R. racemosum | pink | 1.5 | 1.5 | |
'Rosata' [114] | deciduous azalea | pink (rose) | 4.0 | 2.5 | |
'Saint Merryn' [115] | blue (violet) | 4.0 | 2.5 | ||
'Satan' [116] | red (scarlet) | 2.5 | 2.5 | ||
'Scarlet Wonder' [117] | red (scarlet) | 1.5 | 1.5 | ||
'Silver Slipper' [118] | white/yellow | 2.5 | 2.5 | ||
'Squirrel' [119] | evergreen azalea | orange | 1.0 | 1.0 | |
'Strawberry Ice' [120] | deciduous azalea | pink/orange | 2.5 | 2.5 | |
'The Honourable Jean Marie de Montague' [121] | red (crimson) | 2.5 | 2.5 | ||
'Tidbit' [122] | yellow (cream) | 1.0 | 1.5 | ||
'Tortoiseshell Wonder' [123] | salmon pink | 2.5 | 2.5 | ||
'Vintage Rosé' [124] | pink (rose) | 1.0 | 1.0 | ||
'Vulcan' [125] | red (scarlet) | 1.5 | 1.5 | ||
'Vuyk's Rosyred' [126] | pink (rose) | 1.0 | 1.5 | ||
'Vuyk's Scarlet' [127] | red (scarlet) | 1.0 | 1.5 | ||
'Wee Bee' [128] | pink/red | 0.5 | 1.0 | ||
'White Lights' [129] | white | 1.5 | 1.5 | ||
'Yaku Fairy' [130] | R. keiskei var. ozawae | yellow (lemon) | 0.5 | 1.0 |
Fuchsia is a genus of flowering plants that consists mostly of shrubs or small trees. The first to be scientifically described, Fuchsia triphylla, was discovered on the Caribbean island of Hispaniola about 1696–1697 by the French Minim monk and botanist, Charles Plumier, during his third expedition to the Greater Antilles. He named the new genus after German botanist Leonhart Fuchs (1501–1566).
Delphinium is a genus of about 300 species of perennial flowering plants in the family Ranunculaceae, native throughout the Northern Hemisphere and also on the high mountains of tropical Africa. The genus was erected by Carl Linnaeus.
Cistus is a genus of flowering plants in the rockrose family Cistaceae, containing about 20 species. They are perennial shrubs found on dry or rocky soils throughout the Mediterranean region, from Morocco and Portugal through to the Middle East, and also on the Canary Islands.
Commonly known as hellebores, the Eurasian genus Helleborus consists of approximately 20 species of herbaceous or evergreen perennial flowering plants in the family Ranunculaceae, within which it gave its name to the tribe of Helleboreae. Despite names such as "winter rose", "Christmas rose" and "Lenten rose", hellebores are not closely related to the rose family (Rosaceae). Many hellebore species are poisonous.
Dasiphora fruticosa is a species of hardy deciduous flowering shrub in the family Rosaceae, native to the cool temperate and subarctic regions of the northern hemisphere, often growing at high altitudes in mountains. Dasiphora fruticosa is a disputed name, and the plant is still widely referenced in the horticultural literature under its synonym Potentilla fruticosa. Common names include shrubby cinquefoil, golden hardhack, bush cinquefoil, shrubby five-finger, widdy, and kuril tea.
Papaver orientale, the Oriental poppy, is a perennial flowering plant native to the Caucasus, northeastern Turkey, and northern Iran.
Helianthemum, known as rock rose, sunrose, rushrose, or frostweed, is a genus of about 110 species of flowering plants in the family Cistaceae. They are widely distributed throughout the Northern Hemisphere, especially in the Mediterranean.
Erica vagans, the Cornish heath or wandering heath, is a species of flowering plant in the family Ericaceae, native to Ireland, Cornwall, western France and Spain. It is a vigorous, spreading, evergreen heather reaching 75 cm (30 in) tall and wide, with pink flowers borne in racemes 14 cm (6 in) long in summer and autumn. The Latin specific epithet vagans literally means "wandering"; in this context it means "widely distributed".
Maianthemum racemosum, the treacleberry, feathery false lily of the valley, false Solomon's seal, Solomon's plume or false spikenard, is a species of flowering plant native to North America. It is a common, widespread plant with numerous common names and synonyms, known from every US state except Hawaii, and from every Canadian province and territory, as well as from Mexico.
Lavandula angustifolia, formerly L. officinalis, is a flowering plant in the family Lamiaceae, native to the Mediterranean. Its common names include lavender, true lavender or English lavender ; also garden lavender, common lavender, and narrow-leaved lavender.
Dicentra formosa is a flowering plant with fern-like leaves and an inflorescence of drooping pink, purple, yellow or cream flowers native to the Pacific Coast of North America.
Camellia sasanqua, with common name sasanqua camellia, is a species of Camellia native to China and Japan. It is usually found growing up to an altitude of 900 metres.
Rhododendron subg. Hymenanthes is a subgenus of the genus Rhododendron, with a widespread distribution in the temperate Northern Hemisphere. The species are evergreen shrubs and small to medium-sized trees, with medium-sized to large leaves. The flowers are large, produced in terminal trusses of 5-40 together.
Rhododendron rex (大王杜鹃), the king rhododendron, is a tree species, usually 5–8 m (16–26 ft) in height, in the family Ericaceae. It is found in China, India, and Myanmar, where it is threatened by habitat loss. The flowers are creamy-white, or pale yellow to pink, with a crimson basal blotch. The leaves are 17–27 cm in length and are covered on the underside with an indumentum that ranges in colour from greyish to rusty brown.
Rhododendron arboreum, the tree rhododendron, is an evergreen shrub or small tree with a showy display of bright red flowers. It is found in Bhutan, China, India, Myanmar, Nepal, Sri Lanka, Pakistan and Thailand. It is the national flower of Nepal. In India it is the state tree of Uttarakhand and state flower of Nagaland.
Cyclamen repandum, the spring sowbread, is a species of flowering plant in the family Primulaceae, native to southern Europe and some Mediterranean islands. It is the most widespread of a group of cyclamens with wide, heart-shaped leaves, often coarsely toothed or lobed, and late spring-blooming flowers with long, slender petals.
Acer palmatum, commonly known as Japanese maple, palmate maple, or smooth Japanese maple (Japanese: irohamomiji, イロハモミジ, or momiji,, is a species of woody plant native to Japan, Korea, China, eastern Mongolia, and southeast Russia. Many different cultivars of this maple have been selected and they are grown worldwide for their large variety of attractive forms, leaf shapes, and spectacular colors.
Rhododendron argyrophyllum (银叶杜鹃) is a species of flowering plant in the heath family Ericaceae. It is native to forested slopes at 1,600–2,300 m (5,200–7,500 ft) in E and NW Guizhou, S and W Sichuan, and NE Yunnan in China.
Rhododendron degronianum is a species of rhododendron native to northern parts of Honshu, the largest island of Japan, where it grows at altitudes of about 1,800 meters (5,900 ft).
Rhododendron racemosum, the racemose rhododendron, is a species of flowering plant in the heath family Ericaceae, native to forest and grassland at 1,500–3,500 m (4,900–11,500 ft) in northwestern Guizhou, southwestern Sichuan, and Yunnan, China.