Knowledgebase
PJMs are dying & Azaleas are not doing well #423930
Asked August 28, 2017, 6:07 PM EDT
Northampton County Pennsylvania
Expert Response
Hello, and thanks for using the Ask an Expert System,
Azaleas and rhododendrons are easy to grow and are usually disease and pest free. Both of your plants should grow on the east side of your house where they should get morning sun, but be shaded from the hot afternoon sun. Soil pH is very important to both these plants. They are acid loving evergreens that will not do well in neutral or basic soil. They prefer a pH of about 5.5, and well drained organic rich soils. You should have your soil tested to make sure that the pH is appropriate and the nutrient levels are correct for these shrubs. You can get a soil test kit from your nearest Penn State Extension office (link below.)
Both plants would benefit from an organic mulch such as wood chips. Stone mulches do not keep the soil moist, and may alter the soil pH.
Diseases and insect pests are usually not present if the plant is healthy and not stressed. A soil pH that is too high and moisture stress contribute to disease and insect pests.
That said you might have an insect pest problem. Check the plants carefully. Examine the leaves for any sign of feeding insects or discoloration.
You can find more information on PJM Rhododendron in Rhododendron (PJM) Group from the Missouri Botanical Garden. Additional information on soil preparation and planting can be found in Amazing Azaleas and Riotous Rhododendrons from IU Extension.
If you have additional questions you can contact Hort Desk, a free service offered through the Northampton and Lehigh County Extension Offices.
Northampton County Penn State Extension