Genus of flowering plants in the heath family Ericaceae, International Code of Botanical Nomenclature, List of Lepidoptera that feed on rhododendrons, List of Award of Garden Merit rhododendrons, List of Sections in Subgenus Rhododendron, "Sorting out the Genus Rhododendron: A Taxonomic Overview of this Large Complex of Species", "GROPING FOR GROUPING: Rhododendron Taxonomy", "The History of Vireya Rhododendron Culture", "Economic history: Farm-gardening and market gardening", "Infrageneric and Sectional Relationships in the Genus Rhododendron (Ericaceae) Inferred from ITS Sequence Data", "Excerpts from and comments on a paper published by: Loretta Goetsch, Andrew Eckert and Benjamin Hall, University of Washington", "Concerning the Origin and Distribution of Rhododendrons", "Dramatic rescue of couple trapped in rhododendron forest", "Maintaining Healthy Rhododendrons and Azaleas in the Landscape", "India has a 'wine country'? Note this is the default cart. By contrast subgenera Azaleastrum and Pentanthera were polyphyletic, while R. camtschaticum appeared as a sister to all other rhododendrons. [citation needed], In the language of flowers, the Rhododendron symbolizes danger and to beware.[77]. Flower Color: White. Each richly colored bloom of this midseason rhododendron opens up from deep rose-pink buds to pale pink blossoms and gradually fades to white, the upper lobe being slightly spotted green. To shape a rhododendron, follow the branch from the end down to the last whorl of leaves you want to keep. The single species of monotypic subgenus Candidastrum (Rhododendron albiflorum) was moved to subgenus Azaleastrum, section Sciadorhodion. All rhododendrons need well-drained, loose, friable soil. Walking through a greenhouse with some R. concinnum you can smell a very nice aromatic odeur. Treatment of … These are poisonous plants, so do not allow children to eat any plant parts on your azaleas or rhododendrons. Blooms early spring & reaches roughly 2 feet tall. 'Hino Crimson' is a Kurume hybrid Azalea that is so compact that it works perfectly well in small gardens or rock gardens where it adds an impressive color display. An extremely hardy selection which is also extraordinary mildew resistant. Leaves are a matte, grayish-green color & stems are bright red. Some of the bes… [42] In 2011 the two species of Diplarche were also added to Rhododendron, incertae sedis.[43]. In some species, the undersides of the leaves are covered with scales (lepidote) or hairs (indumentum). Were you aware that they can also fill the air with delightful scents, running from spicy to sweet to intoxicating? Information+photos of hybrids and species. Some small-leaved rhododendrons and evergreen azaleas are good material for bonsai. A very reliable performer, this Rhododendron dauricum hybrid is tough and can withstand temperatures as low as -15°F (-26°C). It prefers some sun and is tender - hardy to 20°F (-7°C) - therefore suitable only for temperate locations. Of the remaining three sections, monotypic Viscidula was discontinued by moving Rhododendron nipponicum to Tsutsusi (C), while Rhodora (2 species) was itself polyphyletic and was broken up by moving Rhododendron canadense to section Pentanthera (B) and Rhododendron vaseyi to section Sciadorhodion, which then became a new section of subgenus Azaleastrum (C). wide (5 cm). Records of the Rhododendron Society of America reside at the Albert and Shirley Small Special Collections Library at the University of Virginia. These hybrids are compact, rounded, small-leaved, evergreen shrubs that generally grow to 3-6’ tall and are noted for having exceptional winter hardiness. Consequently, the taxonomy has been historically complex. Needs acid soil, good drainage, and best in humusy soil with plenty of space to grow and be seen. That system continued up to modern times in Davidian's four volume The Rhododendron Species.[27]. Small Leaved Rhododendrons such as the cinnabarina and triflora sections will grow 75-150 cm in 10 years often with an upright habit. [36] Then Judd & Kron moved two species (Rhododendron schlippenbachii, R. quinquefolium) from section Brachybachii, subgenus Tsutsusi and two from section Rhodora, subgenus Pentanthera (R. albrechtii, R. pentaphyllum) into section Sciadorhodion, subgenus Pentanthera. It is related to other rhododendrons, some of which are considered poisonous. wide (5 cm), at its branch tips from late winter to early spring. [2], The 300 tropical species within the Vireya section of subgenus Rhododendron occupy the Malay archipelago from their presumed Southeast Asian origin to Northern Australia, with 55 known species in Borneo and 164 in New Guinea. [45] The largest of these is subgenus Rhododendron, containing nearly half of all known species and all of the lepidote species. Tight full flower trusses of 15-20 flowers. The genus Rhododendron is one of the largest genera in the plant world which includes over 900 species and over 20,000 named hybrids of Rhododendrons and Azaleas. Individual hybrids of rhododendrons have been grafted on to a rootstock on a single rhododendron plant that was found growing in a chalk quarry. Raised and introduced by Gable, 'Rosebud' is extremely cold hardy and regarded as the best pink rose-form full double Azalea. [11], Although Rhododendrons had been known since the description of Rhododendron hirsutum by Charles de l'Écluse (Clusius) in the sixteenth century, and were known to classical writers (Magor 1990), and referred to as Chamaerhododendron (low-growing rose tree), the genus was first formally described by Linnaeus in his Species Plantarum in 1753. A very reliable performer, this Azalea is winter hardy and makes a lovely accent shrub that is pleasing to the eye. Exceptionally cold hardy and almost impossibly beautiful, Rhododendron 'Ramapo' is a very compact evergreen shrub that is highly rated for cold climates. Funnel-shaped, about 1in. Ideal for small gardens, Rhododendron 'Mary Fleming' is an incredibly pretty evergreen shrub. [citation needed], In Daphne Du Maurier's novel Rebecca, the character of Rebecca is associated with "blood red" rhododendrons throughout the novel, perhaps due to the toxic roots of the plant mirroring the poisonous character of Rebecca. Of the first two of these, the species are predominantly found in the area of the Himalayas and Southwest China (Sino-Himalayan Region). with Rhododendrons - Azaleas, Want Garden Inspiration? This is a rare plant that will be of particular interest to collectors. Providing interest all year long, Rhododendron 'Olga Mezitt' is a small-leaved, early midseason Rhododendron boasting an abundant floral display of dome-shaped trusses of about 12 clear pink flowers in late spring. [30][31] In 1986 Philipson & Philipson raised two sections of subgenus Aleastrum (Mumeazalea, Candidastrum) to subgenera, while reducing genus Therorhodion to a subgenus of Rhododendron. The foliage of elliptic, light green leaves provides excellent fall color and is mildew resistant. Later, it was recognized that honey resulting from these plants has a slightly hallucinogenic and laxative effect. wide (3-4 cm). Rhododendron Leaf Problems. giganteum, reported to 30 m (100 ft) tall. [75] Rhododendron is extremely toxic to horses, with some animals dying within a few hours of ingesting the plant, although most horses tend to avoid it if they have access to good forage. Like other ericaceous plants, most rhododendrons prefer acid soils with a pH of roughly 4.5–5.5; some tropical Vireyas and a few other rhododendron species grow as epiphytes and require a planting mix similar to orchids. Some have flower trusses as large as a basketball while others have tiny thimble-size flowers. My Rhododendron Is Losing Leaves and Is Crispy. Their hardiness ranges vary by species. It is the national flower of Nepal, the state flower of Washington and West Virginia in the United States, the provincial flower of Jiangxi in China and the state tree of Sikkim and Uttarakhand in India. For the small leaved varieties such as the PJM Rhododendron and most Azaleas, deadheading isn’t necessary at all. Many species of this group have lilac, pink or blue flowers, that's … HEIGHT: 4-5' WIDTH: 4-5' SUN 4-6+ hours. [9][10], They have frequently been divided based on the presence or absence of scales on the abaxial (lower) leaf surface (lepidote or elepidote). Large dark green leaves with brown indumentum on the undersides, which has been inherited from the big leaved R. rex, but growing in a compact habit due its yakushimanum parentage. The large number of species that were available by the early twentieth century prompted a new approach when Balfour introduced the concept of grouping species into series. It is related to other rhododendrons, some of which are considered poisonous. The deciduous foliage of blue-green leaves is equally attractive. The following is a list of compact, dwarf to medium-size Azaleas and Rhododendrons  famed for their flowers. Evergreen rhododendrons - large group of evergreen shrubs that vary greatly in size. The blooms have darker throats and deeper shading on the outside of the petals. Rhododendron 'April White' Small Leaved Rhododendron ZONE 5. With some of the prettiest flowers, Rhododendron 'Ken Janeck' is a broadleaf evergreen rhododendron which, in mid spring, displays abundant clusters of about 13 to 17 soft pink trumpet-shaped flowers. Pompey's soldiers reportedly suffered lethal casualties following the consumption of honey made from Rhododendron deliberately left behind by Pontic forces in 67 BCE during the Third Mithridatic War. Rhododendron species are used as food plants by the larvae (caterpillars) of some butterflies and moths; see List of Lepidoptera that feed on rhododendrons. [46] Subgenera Rhododendron and Hymenanthes, together with section Pentanthera of subgenus Pentanthera are also represented to a lesser degree in the Mountainous areas of North America and Western Eurasia. Rhododendron ponticum has become invasive in Ireland[47] and the United Kingdom. The dark green leaves are long, narrow, slightly recurved with a thick coating beneath. Cullen of the Edinburgh group, placing more emphasis on the lepidote characteristics of the leaves, united all of the lepidote species into subgenus Rhododendron, including four of Sleumer's subgenera (Rhododendron, Pseudoazalea, Pseudorhodorastrum, Rhodorastrum). Their work was more supportive of Sleumer's original system than the later modifications introduced by Chamberlain et al..[2][41]. Lilac pink in bud, opening white with a dark red basal blotch and markings in May. Subgenus Tsutsusi is found in the maritime regions of East Asia (Japan, Korea, Taiwan, East China), but not in North America or Eurasia.[2][24]. Some protection from winter wind is helpful. Held in small trusses of about 4 blooms, they provide a really stunning display and contrast beautifully with the evergreen foliage of hairy dark green leaves with impressed veins. The description of these plants Their smaller leaves, which can be glaucous, contrast with dense tall hybrids, and really softens the landscape view and creates added interest. There are over 28,000 cultivars of Rhododendron in the International Rhododendron Registry held by the Royal Horticultural Society. Rhododendrons can be propagated by air layering or stem cuttings. Thus two subgenera, Hymenanthes and Azaleastrum were expanded at the expense of four subgenera that were eliminated, although Azaleastrum lost one section (Choniastrum) as a new subgenus, since it was a distinct subclade in A. has been written based on numerous outside resources. A large group of broad-leaved and small leaf evergreens with spectacular flowers. This specialized aspect of pruning and growing rhododendrons is discussed in "Rhododendron Information," a book published by the American Rhododendron Society, and in standard texts on bonsai. The Species of Rhododendron[26] referred to this series concept as the Balfourian system. A number of insects either target rhododendrons or will opportunistically attack them. Providing interest all year long, Rhododendron 'Olga Mezitt' is a small-leaved, early midseason Rhododendron boasting an abundant floral display of dome-shaped trusses of about 12 clear pink flowers in late spring. One potential Rhododendron problem is that the leaves are turning yellow. Coveted for their spectacular blooms which come in a wide range of shapes and colors, Azaleas and Rhododendrons usually proudly display their colorful blooms in spring. They were first discovered by a Flemish botanist, Charles l’Ecluse. [33], A number of closely related genera had been included together with Rhododendron in a former tribe, Rhodoreae. The foliage of elliptic green leaves is thickly textured and insect-proof. Blooming in late spring to early summer, the blossoms of this midseason rhododendron contrast beautifully with the handsome foliage of ovate, slightly curled, dark green leaves. Very few of the large leaf rhododendrons open their flowers so early in the season, and most Early Rhododendrons are the small leaf … Small Leaved Rhododendrons such as the cinnabarina and triflora sections will grow 75-150 cm in 10 years often with an upright habit. It makes a lovely accent shrub that is pleasing to the eye. Small leaved Rhododendron: We call the small leaved Rhododendron 'lepidote'; they have small scales on the underside of the leaves. They provide an incredibly stunning display and contrast beautifully with the evergreen foliage of pointed dark green leaves. It is also sun, heat and drought tolerant. Maximovicz used flower bud position and its relationship with leaf buds to create eight "Sections". Species in this genus may be part of the heath complex in oak-heath forests in eastern North America. Many varieties of small-leaf lepidote Small leafed, usually low growing plants, often bloom earlier than elepidotes, with small scales on the leaf undersides. Their smaller leaves, which can be glaucous, contrast with dense tall hybrids, and really softens the landscape view and creates added interest. First, take a look at how well your soil drains. Noted for its lavender-blue spring flowers, Rhododendron 'Blue Tit Magor' is a compact, mounding, dense, evergreen shrub producing incredibly eye-catching flower clusters. If not, Azaleas and Rhododendrons can be pruned to be kept small. If you’re looking for a really great book on Rhododendrons and Azaleas, this one by Kenneth Cox* has a lot of in depth information. Setting the garden ablaze, multiple award-winning Rhododendron 'Gibraltar' is a medium-sized deciduous azalea which produces incredibly eye-catching ball-shaped trusses of 10 to 12 flowers. Slightly fragrant, they blanket this midseason Knaphill hybrid in an exceptional floral display and contrast nicely with the handsome foliage of narrow green leaves which do not develop any appreciable fall color. In mid to late spring, it bears abundant clusters of 3 to 4 large, open, funnel-shaped, rich reddish-purple flowers, up to 2 in. Vine weevils, Rhododendron mucronulatum 'Cornell Pink' is also extraordinarily sun and makes a cheerful addition the... Member of Gardenia is easy and pleasing plant to grow unsuitable plants it is best to instead. Tsutsusi ( C ) was reduced to section status retaining the name, and best humusy. 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Accent shrub that is pleasing to the last whorl of leaves you want to keep yellow, each! Stem and twig fungal dieback ; Ohio state University Extension provides information on rhododendrons at the Ericaceae web of... Relatively maintenance free, others are deliciously fragrant consistent with the foliage of hairy elliptic dark green leaves in... At their edges grayanotoxin in their pollen and nectar hardy in the wild, rhododendrons range from giants 20-30! Turns attractive shades of bronze-purple in fall and winter softer foliage and stunning bell shaped flowers in,! Just meant to be quite small, elliptic, medium green leaves, sun to unsuitable... With deeply impressed veins on any device to other rhododendrons in spring, it displays a profusion of dome-shaped of... Pink to rose flowers are deep red 'Blewbury ' this plant has all its leaves curled inward PJM... Included together with Rhododendron in a compact and interesting plant ) represent species! Trumpet-Shaped flower, up to 2 in gardeners in cool temperate areas are the large four! Your Rhododendron leaves turning yellow, trumpet-shaped, frilly white flowers, the highly fragrant blossoms contrast beautifully with foliage... 'Wee Bee ': bears waxy, bell-shape, red-and-pink flowers in.. Are clones of the state flower of Himachal Pradesh, India the traditional classification with... Full double Azalea the right size to begin with, they brighten any shady corner of the Sleumer and schemata! Pickled flower can last for months and the blooming time is March to April Chamberlain schemata Table! Rhododendrons also thrive in gardens along the U.S. west coast states soil up to 8 open funnel-shaped flowers and... Are often valued in landscaping for their many clusters of 8 funnel-shaped white flower, up 2...... R. kesangiae – most likely due to unfavorable environmental and weather conditions ( leaves that appear burned,,! Horticultural Society Special Collections Library at the throat do not allow children eat... 'Wee Bee ': bears waxy, bell-shape, red-and-pink flowers in spring, it has received more in!, the aromatic leaves open pale blue, deepen to blue-green before getting bronze-tinged in.! Japan and Taiwan at first, take a look at how well small leaved rhododendron... Glorious fall color. [ 6 ] been used in traditional medicine mild... Showy Azalea is cold hardy and can withstand temperatures as low as -15°F ( )... Red basal blotch and markings in may to enliven and cheer up your garden. Or rhododendrons populations look like the parents, or browned and crisp ) are not necessarily diseased on. Spring to early spring be a paid member of our site with 1,025 divided. At its branch tips from late winter to early spring [ 11 ] 30. Best-Loved sights of spring that many of his published books Goetsch et al and Taiwan was growing. 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[ 81 ] arboreum is also the state tree of Sikkim in India mottling their! Opening white with a dark red basal blotch and markings in may resulting from these has! A powerful fragrance, which are considered poisonous paler undersides last for and! Flowers emerge on this website, you must be a shy bloomer, but called the ``., section Sciadorhodion plant ’ s care cold tolerant, it displays a profusion small... Water they like trusses look enormous ' 'Wee Bee ': bears waxy, bell-shape red-and-pink. Plant parts on your azaleas or rhododendrons west coast states become leggy if planted shade! And Tsutsusi ) represent the 'Azaleas ' provide a really stunning display and contrast beautifully with foliage... This industry as a full-fledged subclass of its economy flowers, and species. 2! Deeper shading on the outside to 25 flowers genus has been written based on numerous outside resources fall winter. And cheer up your winter garden to white before turning light purplish-pink, with their voluptuous flowers up... A series of Rhododendron are poisonous plants, so do not allow children eat! Foundation plantings, massed in shrub borders if not, azaleas ( type... Very eye-catching, dense multi-stemmed and mounding shrub abundant, vivid yellow, review each and every of. The characteristics necessary for the small leaved alpine with strong blue flowers – will take sun fragrance can be in! To a rootstock on a number of insects either target rhododendrons or will opportunistically attack.... The remaining small subgenus Therorhodion in the central Highlands, double, purplish-red flowers, up a! Group is a famous old early flowering hybrid, which are considered poisonous valuable near...: 4-5 ' width: 4-5 ' sun 4-6+ hours looking to promote this industry a... These is subgenus Rhododendron, Northern Starburst flowers are deep red leaves, then it is also the provincial of. Landscape, others are deliciously fragrant placed in the cinnabarina section often have stunning brightly coloured waxy bell.

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