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Background information on Rhododendron genestrianum in the Burncoose Gardens.
Later flowering rhododendrons in Chelsea week at Caerhays. That's end of May for non-uk visitors.
First off - Rh. ‘Lem’s Monarch’,
Rh. ‘Fabia’,
Rh. decorum
Rh. lindleyi
Rh. ‘Nancy Evans’