In the Northeast, early spring or early fall planting is the best time to put a rhododendron into the ground. In this regard, the garden is committed to integrating conservation and biodiversity education, as well as recognizing “significance to horticulture” into its curatorial philosophy and programming. H1 Tender (mild frosts only). SAVE $150. Our specimens of R. decorum subsp. Medium rhododendrons will grow to 1/2m x 1/2 in 6-10 years so 1 1.5m spacing is good. Rhododendron Care | Planting and Maintenance Tips. 'u2': 'www.botanicalgarden.ubc.ca', September 19, 2016 September 21, 2016 Canada's Local Gardener Magazine 7759 Views Ontario Gardener The delicate mauve of a rhododendron flower cannot be imitated in any other flower. Many species are surprisingly glandular and aromatic and the faint smells of camphor, licorice, peach and sandalwood mix and linger in the area. Beware of pruning old (pre 1950s) plants grafted on R. ponticum which tend to sucker. Rhododendron Hybrids; A Guide to Their Origins. 'u6': 'NA', Dwarf rhododendrons and evergreen azaleas are best planted in clumps 60cm apart so that they carpet the ground. Send additions and corrections to the Office Administrator at address below. Rhododendrons have no ultimate size, they can carry on growing indefinitely. 'send_to': 'DC-8341466/tpr/tpartfb0+unique' At 2.5 m tall, these Himalayan beauties show manzanita-like peeling stems and rich scarlet flowers atop waxy rounded leaves. Grandma's Hat. Glendoick never use R. ponticum as an understock and only use ‘Cunningham’s White’, other rootstocks which throw very few suckers. K.W. How to Choose Rhododendrons. $25.00. Quantity . Dig the hole twice as big as the pot, but no deeper than it. Immediately after flowering, in early May, is the best time to prune the Rhododendron. Widely grown lavender-pink ‘P.J.M.’ rhododendron (R. [PJM Group] ‘P.J.M.’) (Photo by Stephen Westcott-Gratton) The colour spectrum of my garden widened dramatically this week as the first rhododendrons began to flower in various shades of white, pink, orange, red and magenta. 1 gal. flavorufum, or R. wiltonii, a reptilian delight with its glossy, bullate upper leaf surface. Choose the spot where you can enjoy the rhododendron. Rhododendron cinnabarinum subsp. You can search our online catalogue by hardinessH6 Hardiest, -24C (-10F) and below suitable for inland areas in N. Europe: H5 Very hardy: -18C (0F) and below, coldest UK inland areas, amongst hills, much of N Europe. When shopping for rhododendron or azaleas, pay attention to when they flower. If I like a particular species of plant, I collect a lot of them! Provided with a cool root run handsome shade and these plants will thrive. Homer E. Salley & Harold E. Greer. Peter spent more than 30 years developing the Asian Garden and he led or participated in nine field and seed collecting expeditions to China, South Korea and northern Vietnam. Rhododendron species (but not hybrids) can be raised from wild collected or hand pollinated seed. For species and more unusual hybrids you will have to go to one of the many specialist nurseries like this one at Glendoick. Throughout the modern history of UBC Botanical Garden, rhododendrons have been a high collection priority. Not reliably hardy outdoors at Glendoick but reliably hardy in Argyll, Cornwall, West Wales, Ireland and similar climates. Rhododendron and Azalea Hardiness. 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. 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. Another standout is R. oreodoxa var. Glendoick Mail Order 2020-21 October-March. Cultivated in the Carolinian Forest Garden are wild-collected rhododendrons, including R. catawbiense, R. maximum, R. minus, and the deciduous R. canescens, R. arborescens, R. vaseyi, R. prinophyllum and R. calendulaceum. In the UK, it is rarely extreme cold that causes damage so don’t pay too much attention to minimum temperature ratings. 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. Only in the more open E. H. Lohbrunner Alpine Garden do the smaller-leafed, sun-loving rhododendrons remain in their ascendency. In his field notes, he records it as ‘A forest tree with handsome foliage, truss with 12-18 flowers…it goes right to the summit where it forms forests…it should be hardy’. 1997. However, they mostly do and those flowers are often delightful. Royal Horticultural Society. We use divisions of hardiness which have now been adopted by R.H.S. Yes! The Garden is not particularly well-endowed with respect to conventional hybrids. 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