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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.
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 ...
Rhododendron flammeum, also known as the Oconee azalea after the river in Georgia where was first discovered. [1] With a species name of flammeum, it can be confused with the flame azalea (Rhododendron calendulaceum). [1] Growing in the form of a shrub in dry woods, on slopes, ridges and stream bluffs, the Oconee blooms in the spring. [4]
Satsuki azalea bonsai, 3.5" tall. Satsuki azalea is a cultivar group of the genus Rhododendron, a type of azalea extensively cultivated and hybridized by the Japanese. It is native to the mountains of Japan. Satsuki azaleas have a diverse range of flower forms and color patterns with multiple patterns often appearing on a single plant.
Rhododendron calendulaceum grows in well-drained, mesic to moist, medium to fine textured soils in part shade. Rhododendron calendulaceum prefers a pH range of 4.3 to 5.8. Rhododendron calendulaceum requires a minimum soil depth of 14 in. Rhododendron calendulaceum requires at least a 200 day growing season. [16]
Rhododendron albrechtii is a species of flowering plant in the family Ericaceae. [1] It is endemic to Japanese temperate rainforests. Native of central and northern Japan; described from specimens collected in the 1860s by Michael Albrecht of the Russian Consulate at Hakodate, for whom the species is named.
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