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Old wood hydrangeas can be cut back by one third. Don't prune these hydrangeas down to the ground, but, if you're trying to reduce the size of the plant, trim it down by one third.
The society provides a means through which people interested in rhododendrons and azaleas can communicate and cooperate with others via its publications, events, local and regional meetings and international conferences. Society activities include public education, plant sales, flower shows, seed exchanges, and scientific research.
Rhododendron 'Polar Bear' (R. auriculatum × R. decorum subsp. diaprepes) - very late flowering rhododendron with heavily scented white trumpet-shaped flowers; Rhododendron 'Winsome' (right) Rhododendron 'Winsome'- remontant rhododendron blooming twice a year: red buds in winter and cerise blossom in June
Rhododendron sect. Schlippenbachia T.Yamaz., 1996 Rhododendron sect. Sciadorhodion is a subsection of subgenus Azaleastrum in the genus Rhododendron . It comprises 16 species of deciduous shrubss native to East Asia and North America.
In cultivation, Rhododendron spinuliferum grows best in acidic soils of pH 4–6 with a shady aspect and significant organic material in the soil, [2] although excess shade will result in few flowers and leggy habit. Readily propagated by seed or cuttings, it flowers in four to five years from seed.
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The Rhododendron Species Foundation and Botanical Garden (RSBG) on 22–24 acres is a nonprofit botanical garden specializing in rhododendrons in Federal Way, Washington. As of 2006 the Foundation's mission is devoted to the conservation, research, acquisition, evaluation, cultivation, public display, and distribution of rhododendron species.