Information from the Jepson Horticultural Database for Rhododendron occidentale
Given excellent drainage (modification of compacted or other water-holding soils may be necessary) and moderate summer watering or continuously moist or wet soil, grows especially well in zones 4, 5, 6, 15, 16, and 17.
Given excellent drainage (modification of compacted or other water-holding soils may be necessary), moderate summer watering or continuously moist or wet soil, and full or part shade (morning and winter sun may be tolerated), grows especially well in zones 7 and 14
and also in zones 3, 19, 20, 21, 22, 23, and 24.
Cultivars available in the horticultural trade.
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