P.J.M. rhododendrons are a group of hybrids, the result of a cross between R. mucronulatum and R. minus var. compacta. Slow growing, it can take up to 10 years for a P.J.M. rhododendron to reach its full height of 4 to 6 feet. P.J.M. rhododendrons are evergreen, with bronze foliage in the fall and heavy flowering in mid to late April. Prune the P.J.M. rhododendron immediately after flowering.
Prune all dead branches and twigs from the P.J.M. rhododendron.
Remove all dead flowers with the pruning shears. Cut the stems back to within 1/2 inch of new growth. If there are no buds on the stem, completely remove it back to its point of origin.
Remove any diseased shoots last by cutting them back to a main branch. Don't drop the diseased foliage onto the soil, but bag and dispose of it immediately.
Soak your pruning shears in a solution of 1/4 cup of Lysol disinfectant and 2 cups of water. Do not use bleach or alcohol because these materials cause rust on gardening tools.