PJM Rhododendron (Rhododendron hybrid) is an evergreen shrub with bold flowers early in the spring season. It will also flower again in the autumn, though not as prolifically as the spring flush.
The clusters of flowers are in shades of pink and purple. It grows to a large mound that is about 5 to 6 feet high and wide. It is hardy to USDA zones 4 through 8.In the winter time, the PJM’s foliage turns purple-bronze which curl up into a tight cylinder during periods of freezing temperatures.
Its namesake is Peter John Mezitt, a Latvian immigrant who settled in Boston and opened the Weston Nursery there in 1923. PJM is a cross between the very hardy Rhododendron dauricum var. sempervirens from the Mongolian borderlands and the native Rhododendron carolinianum.
PJM is one of the easiest and hardiest of the rhododendrons to grow in our region as it is both heat- and cold-tolerant. It likes filtered shade or morning sun and acidic soils, amended with lots of organic materials such as leaf mold and pine bark. It is sterile and does not set seed. It can be propagated by layering or cuttings.
PJM Rhododendron: You Can Grow That!
The video was produced by Washington Gardener Magazine as part of our Plant Profile series for Mid-Atlantic USA gardeners.
Video and editing by Jessica Harden
Audio and text by Kathy Jentz
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