How to Prune a P.J.M. Rhododendron

Overview

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.

Step 1

Prune all dead branches and twigs from the P.J.M. rhododendron.

Step 2

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.

Step 3

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.

Step 4

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.

Tips and Warnings

Things You'll Need

  • Pruning shears
  • Bag
  • Lysol disinfectant

References

  • University of Connecticut: Rhododendron PJM Hybrids
  • American Rhododendron Society: Pruning and Dead-Heading
  • "‬California Master Gardener Handbook‭"; ‬Dennis R.‭ ‬Pittenger‭; ‬2002
  • Washington State University: Sterilized Pruning Tools: Nuisance or Necessity?
  • University of California: How Disinfectants Compare in Preventing Transmission of Fire Blight
Keywords: prune PJM rhodendrons, trim PJM rhododendrons, pruning flowering shrubs

About this Author

Victoria Hunter has been a freelance writer since 2005, specializing in gardening-related topics and the real estate industry. She is a former broadcaster and real estate agent who has provided audio and written services to small businesses and large corporations worldwide. She writes for Ancestry.com, GardenGuides and ProFlowers, among others. Hunter holds a Bachelor of Arts in English/creative writing.