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Rhododendron, Rosebay (large-leaf)

Species. Robust, broad, upright. Fast growing, about twelve inches a year. Grows superbly in shade where it develops large, lustrous leaves. Small white to pale pink flowers in June. This species occurs naturally in the mountains of the southeastern USA. PP -- This cultivar or species has been selected as a "Proven Performer" by the Massachusetts Chapter of the American Rhododendron Society and performs consistently well in USDA Zones 5 and 6 Massachusetts landscapes. Rhododendrons prefer rich, humusy, acidic soil that drains well. Sandy or dry soil, as well as heavy clay, should be amended before planting by adding peat moss, peat humus, or compost. Mulch helps retain moisture, control weeds, and cool the soil. Because they are shallow-rooted, it is easy for them to dry out and, at the same time, drown if over-watered. Refer to our Watering Guidelines. Although most are adaptable to full sun or full shade, the large-leaf varieties perform best in partial shade with protection from harsh summer and winter sun as well as wind. If the site receives full sun or the site is overly windy, a late fall application of an antidesiccant spray may help reduce any winter leaf damage. In dry years providing additional water in the fall will also help. Removing spent flowers promotes new growth. Pruning is rarely required but if necessary should be done immediately after flowering. Wait too long and you’ll inadvertently prune off the buds forming for the next year’s flowers. For more detailed information on rhododendron planting and care, please see our Gardening Guidelines.