K.W. Ultimately, the garden’s rhododendron collection is less about “stamp collecting” and more about growing the widest range of plants that both hold some justifiable significance and suit the conditions in the garden. Every time I go through my garden to take pictures, I realize that I’m a bit of a plant hoarder. However, as one would expect, Asian rhododendrons, primarily species and selections from Japan, the Himalayas and the mountains of western China (Asia is where the genus reaches its greatest diversity), are among the real jewels here. After flowering, you should cut Rhododendron short. From the horticultural perspective, there are several locally significant plants in the garden (i.e., originating in the Pacific Northwest), such as the hybrids, R. ‘David Lam’ and R. ‘Olympic Lady’, and R. praevernum “Del James selection.” Also prominently displayed are selections of species widely recognized as “superior,” such as R. augustinii ‘Barto Blue’, R. parmulatum ‘Ocelot’, R. argyrophyllum ‘Chinese Silver’ and a range of Japanese R. indicum and R. kiusianum cultivars. 'u8': 'NA', not-featured. Deciduous azaleas can be planted 2m apart and are fine if they grow into oneanother. Both in terms of numbers of taxa and overall beauty, rhododendrons have always been the backbone of the Garden. This group includes plants that are often moderately large leafed and large flowered, and that bloom over a long season. Early varieties can blossom in March, late ones into July or even the fall. The Royal Horticultural Society is the UK’s leading gardening charity. Still, with new rhododendron acquisitions (as well as with acquisitions of all other kinds of plants), the garden is mainly interested in wild seed collections of known provenance. Scattered about the garden are still more groupings, some related and others juxtaposed or separated for other reasons—shade, drainage, ultimate size, flower colour or leaf shape. None of this matters, of course, if the plants can’t be grown, and the garden is committed to maintaining its reputation and stature as a place that people want to visit. 'u9': 'NA', How to Choose Rhododendrons. We use divisions of hardiness which have now been adopted by R.H.S. At 2.5 m tall, these Himalayan beauties show manzanita-like peeling stems and rich scarlet flowers atop waxy rounded leaves. Moving east, the triflorums, such as the richly violet-coloured R. concinnum, pink R. davidsonianum and the mauve, sapphire and sky-toned seedlings of R. augustinii, form elegant thickets, and are commonly planted near large conifers. Today, the value of every plant in the garden must be rationalized in terms of our mission. Quantity . Limit of hardiness at Glendoick. Rhododendron and Azalea Nursery Search. For example, the Himalayan R. arboreum, its various subspecies, varieties and forms, and its close relatives (e.g., R. niveum, R. lanigerum) and the western Chinese R. argyrophyllum and its relatives (including R. floribundum, R. denudatum, R. rirei and R. thayerianum) are primarily located near the garden entrance. $65.00. Quantity . Rhododendron and azalea species are found growing in the wild from the arctic region to the tropics. flavorufum, or R. wiltonii, a reptilian delight with its glossy, bullate upper leaf surface. Plant larger hybrids at 2m spacing for quick effect to fill in 5-8 years and 3 m apart for more long term plans. Care . 'u2': 'www.botanicalgarden.ubc.ca', The Life and Times of a Plantsman in the Sikkim Himalayas: A Memoir. Quantity . We pride ourselves in one of the best ranges of Rhododendron species in the country, and we try to propagate these from collectors' seed, or recognised good forms. 'u6': 'NA', 7 gal 5-6 year old plants. Glendoick Publishing. 3 gal size 3-4 year old plant. With the predominance of high, overhead shade, the larger leafed and taller growing rhododendrons are well represented. Quantity . Aromatic rhododendrons are of course not limited to the taliensias. 3 gal size 3-4 year old plants. A number of accessions of the yellow-flowered, lance-leafed R. lutescens are planted throughout the Asian Garden, displaying much of the range of flower size and colour, phenology (time of flowering), leaf shape and cold hardiness that is inherent in this species. But don’t worry, it is easy to narrow down what you want to a few sections. These shrubs are almost all so attractively shaped and the leaves dressed in such handsome shades and textures of indumentum that one hardly cares if the plants produce a bloom. Fertilizing Rhododendrons and Azaleas benefit from an application of acid fertilizer in the spring. WEB SALES OFFICE WILL BE CLOSED FROM 25TH OF DECEMBER UNTIL 4TH OF JANUARY. Many are well worth growing for their foliage alone! You can amend the soils with peat moss, compost, and other soil acidifiers to keep them happy. Rhododendron plants, similar to many other plants in the Ericaceae family, prefer acidic soils. Dwarf rhododendrons and evergreen azaleas are best planted in clumps 60cm apart so that they carpet the ground. Rhododendron Species Foundation History: http://rhodygarden.org/cms/rsf-foundation/history/. Only in the more open E. H. Lohbrunner Alpine Garden do the smaller-leafed, sun-loving rhododendrons remain in their ascendency. The Encyclopedia of Rhododendron Species. The range of Rhododendron taxa cultivated in the garden includes those derived from the more familiar and stalwart groups, such as subsections Fortunea, Saluenensia, Triflora and Pontica, as well as examples of many less well-known groups, i.e., subgenus Tsutsusi section Brachycalyx (the so-called three-leaf azaleas) and subgenus Hymenanthes section Pontica subsection Glischra (including the unusual R. glischrum subsp. The Asian Garden has a small number of both wild collections and cultivated selections, including a spectacular planting of the waxy, grey-green-blue-leafed R. cinnabarinum subsp. Height 25-50cm in 10 years. Many species are surprisingly glandular and aromatic and the faint smells of camphor, licorice, peach and sandalwood mix and linger in the area. Our online catalogue or 56 page paper catalogue can be daunting. Homer E. Salley & Harold E. Greer. Here’s how to grow rhododendrons. Grafted rhododendrons had a bad reputation, largely due to the traditional use of R. ponticum as an understock, until the 1950s. British Columbia also has its share of Rhododendron species and the BC Rainforest Garden is where visitors can find a number of examples of R. macrophyllum and all three Labrador tea (formerly Ledum) species, R. palustre, R. neoglandulosum and R. groenlandicum. When you’ve seen one in full flower it’s not too hard to understand why. Tall 2m+ in 10 years, ultimately 4-6m x 3-6m or more. In continental Europe the … Not reliably hardy outdoors at Glendoick but reliably hardy in Argyll, Cornwall, West Wales, Ireland and similar climates. 3 year old. In the Northeast, early spring or early fall planting is the best time to put a rhododendron into the ground. The Garden’s rhododendron collection is extensive. Blooms late spring 5-6 ft tall x 4-5 ft spread HARDY to -20°F (-28.9°C) Attracts pollinators Rabbit resistant Evergreen Fragrant. H1 Tender (mild frosts only). Name. Regions suitable for growing rhododendrons and azaleas are those that have naturally acidic soils, adequate water availability, moderate humidity and winds and lack of temperature extremes. Peter A. Cox & Kenneth N.E. The active acquisition of plants, their study and interpretation in both the garden and the field is fundamental for any university botanical garden. Rhododendron Hybrids; A Guide to Their Origins. Rhododendrons and azaleas come in all shapes and sizes from a few inches tall to giant forest trees. The Garden is not particularly well-endowed with respect to conventional hybrids. London. The garden has a few plants that are rare in cultivation, such as R. fulgens, R. cyanocarpum, R. uvarifolium, R. ochraceum and R. yuefengense. Buy Rhododendron plants from Hopes Grove Nurseries. xanthocodon Concatenans Group along Kingdon Ward Way. 1997. K.C.  (R. ‘Sunup-Sundown’ ´ R. ‘Lem’s Cameo’): Jack Lofthouse (1915-2005), Vancouver, BC. Our audience includes researchers, educators and students, as well as a diverse, non-academic community whose constituents appreciate gardens for a multitude of other reasons, including the appreciation of great rhododendrons. 1997. xanthocodon. Of the shrubbier species, R. orbiculare is a crowd favourite. Many new species Rhododendrons have recently been introduced, mainly from the Himalayas, and we include some for the first time. A number of lepidotes are notable for their various odorous emissions, including the triflorums and many of the small-leaved species, but the cinnabarinums take the prize for the most aromatic of the larger lepidotes. In terms of our mission UK areas, including fairly well inland, coastal.! 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