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Hymenanthes, with approximately 225 species, and subgenus Rhododendron, with approx. 400 species, comprise what gardeners typically describe as "Rhododendrons." Two subgenera are generally known to gardeners as "Azaleas", and include many fewer true species: Pentanthera , which comprises the deciduous azaleas, and Tsutsusi , which includes ...
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. Rhododendrons have fibrous roots and prefer well-drained soils high in organic material.
Hardy in USDA zones 4 through 9, it is recommended as a hedge, and has above average resistance to the root rot that often afflicts azaleas. [2] Rhododendron yedoense f. poukhanense is a major parental contributor to many modern hybrid azaleas. [2]
Rhododendron catawbiense, with common names Catawba rosebay, [2] Catawba rhododendron, [3] mountain rosebay, [3] purple ivy, [3] purple laurel, [3] purple rhododendron, [3] red laurel, [3] rosebay, [3] rosebay laurel, [3] is a species of Rhododendron native to the eastern United States, growing mainly in the southern Appalachian Mountains from West Virginia south to northern Alabama.
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.
Rhododendron maximum is a species of Rhododendron native to the Appalachians of eastern North America, from Alabama north to coastal Nova Scotia. Its common names include great laurel , [ 2 ] great rhododendron , rosebay rhododendron , American rhododendron and big rhododendron .
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