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It seems as if the species Rhododendron Hyperethrum is the best parent for heat tolerant hybrids. A Mr. Thorton has produced a group of hybrids exceptionally tolerant to heat. Thorton
has tried them out in the heat box of New Orleans. and they have also a good record with cold tolerance.. One of the hybrids he has produced is called Opal or by some people Opal Thorton. Some are available at Rare Find Nursery along with many other nurseries. There are also some heat tolerant hybrids by the great Japanese rhododendron hybridizer Ito. arfitz