Growth rate: Moderate Average landscape size: Moderate growing; reaches 6 to 8 ft. tall, 8 to 10 ft. wide. growth rates of the invasive Rhododendron reach higher values than plants from the native origins. As long as the area receives shade after 11:00 AM or so, the plants will grow well. The cultivars all vary by their time of blooming, bloom color and USDA hardiness zones. Anyone who wants to grow a hedge for privacy will probably choose one of the more common varieties of Rhododendron which grow up to 6 feet in total height. [7] Microsite requirements for seed germination are relatively specific (e.g., high in organic matter such as rotting logs); hence, the majority of reproduction is vegetative resulting in a clonal distribution. It prefers low to medium light conditions for optimum carbon gain, and has a tremendous capacity for avoiding cavitation during freeze-thaw cycles. 'Compact Maximum' is thought to have originated as a seedling of the hybrid Rhododendron 'Maximum Roseum', a pink flowering form of the native species. Range of Growing Rate The society's website lists 44 named cultivars that grow 1 foot in 10 years, 164 cultivars that grow 2 feet, 366 cultivars that grow 3 feet, 281 cultivars that grow 4 feet, 288 cultivars that grow 5 feet and 186 cultivars that grow 6 feet in 10 years. Material and methods Study species Rhododendron ponticum is an erect, evergreen Ericaceae shrub that reaches a height of 2 /8 m (Tutin et al. There is some evidence to suggest that due to fire suppression and the absence of other cultural activities (i.e., mountain-land grazing), this species has advanced beyond the mesic forest sites into sub-mesic understories. Some of the fastest growing rhododendrons are the Brittenhill Bugle, R. genestierianum, Ilam Cream, Mother of Pearl, Professor Hugo de Vries, Spicy Nutmeg, and the Whidbey Island. This species has historically been confined to riparian areas and other mesic sites but takes advantage of disturbed areas where it is present to advance onto sub-mesic sites. Rhododendron maximum is an evergreen shrub growing to 4 m (13 ft), rarely 10 m (33 ft), tall. If mechanical removal is attempted in the case of forest management, extremely high densities are attained by this species in a matter of a few years. It is capable, however, of reproducing both vegetatively and sexually. It prefers deep well-drained acid soils high in organic matter where it produces a thick, peat-like humus. Rosebay rhododendron is an important structural and functional component of southern Appalachian forest ecosystems. In: Argent, George; McFarlane, Marjory, eds. 400 per capsule). It reproduces vegetatively through a process called ‘layering’ where it produces roots from above ground woody parts when in contact with the forest floor. This species affords protection to steep watersheds and shelter for wildlife. Central and southern Appalachian montane oak forest, 10.2305/IUCN.UK.2018-2.RLTS.T82889952A135956342.en, 10.1674/0003-0031(2001)145[0325:DRMLER]2.0.CO;2, https://en.wikipedia.org/w/index.php?title=Rhododendron_maximum&oldid=982281373, Creative Commons Attribution-ShareAlike License, This page was last edited on 7 October 2020, at 06:02. are flowering shrubs that are hardy in U.S. Department of Agriculture plant hardiness zones 4 through 9, depending on the variety. Many rhododendron plants grow from 3 to 4 feet in 10 years, but some can grow up to 7 feet in 10 years. Rosebay rhododendron is clonal. There are still important questions to be answered regarding this species to completely understand its role in forest understories. What isn’t clear is whether or not we are in a period of advancement or retreat for this species. It is one of the largest and hardiest rhododendrons grown commercially. Flowers of the rhododendron bush grow on a branch. While writing 27 novels of suspense, he has lived on sugar cane, pepper and papaya plantations and helped keep bees in Belize. Slower growing rhododendrons tend to be smaller cultivars while the fastest growers take up more space. Approximately 12,000 square miles in the southern Appalachians are occupied by this species[5] where it dominates the understory. Commercial seed production is generally from cultivated hybrids. Rhododendrons (Rhododendron spp.) The fruit is a dry capsule 15–20 mm (.60-.79 in) long, containing numerous small seeds. It retains its waxy, deep-green leaves for up to … Germination rates range from 75% to 90% . Rosebay rhododendron is a striking and aesthetically pleasing feature of mesic southern Appalachian forests. The leaves can be poisonous. For all its prized qualities as a naturally occurring component of the landscape or as plantings in residential and commercial landscaping, rosebay rhododendron can have an inhibitory effect on regeneration of other plant species. [6] Where extensive overstory mortality has eliminated most of the overstory, this species forms a thick and continuous subcanopy known locally as ‘laurel slicks’ or ‘laurel hells’. Rhododendrons in horticulture and science: International Rhododendron conference: Proceedings; 2002; Edinburgh, UK.
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