Rhododendrons and azaleas are acid loving plants meaning that the soil needs to be slightly acidic to optimize growing conditions. Rhododendrons can get root rot if they don’t have well-drained soil; putting one of these shrubs in a wet spot in the garden is always a mistake. Insect pests include aphids, borers, lacebugs, caterpillars, leafhoppers, mealybugs, nematodes, scale, thrips and whitefly. We have what was a beautifully thriving rhododendron{PJM} that suddenly looks as if it is dying. The Garden wouldn't be the Garden without our Members, Donors and Volunteers. Wildlife Value: Tolerates damage by rabbits. Determining the underlying problem is necessary to restore the rhododendron's health. Are the plants dying or what is the best course of action? Two diseases, branch die-back and Phytophthora root rot in particular, are opportunistic this way. You could dig up one of the plants to see whether its roots are moving out of the planting soil or are just sitting there in the same shape as they were in their planting container. There are dead parts in the middle of all of the plants. Rhododendrons (including deciduous azaleas) may be attacked by several diseases, causing unsightly foliage or a lack of flowers. Here is our trees and shrubs page: https://extension.umd.edu/hgic/topics/trees-shrubsYou might want to take a look at the planting section and the problems section. Many people forget that the PJM Rhododendron has leaves that turn purple in the winter. The 1,0140 known species of Rhododendron range in size from 4 inches to 100 feet tall, with over 20,000 hybrid varieties. When you planted, Maryland was suffering from highly abnormal rainfall. Usually, when problems do occur, they can be traced back to the plant's environment. Variety: The rhododendron or azalea must be suitable for the climate where it is planted. The foliage of elliptic, glossy, dark green leaves turns reddish-purple in fall and winter. Fertilize according to the soil test. PJM is functionally sterile, so it never sets seeds but instead spends its energy reserves producing flowers. The leaves are 3 inches long, smooth green in the summer and purple tinged to bronze in the winter. Diseases include canker, crown rot, root rot, leaf spot, rust, and powdery mildew. It makes a great informal hedge plant. It's considered a "dependable bloomer" because you get consistent color, no matter what the conditions! PJM is not the easiest azalea to grow, hower Ellen. We see no disease or insect problem.First, remove all mulch from the base of the plant. It should be kept back a few inches at least and be about 2-3" deep. How to plant a Rhododendron - Duration: 7:14. Rhododendron and usually elliptic, leathery and dark green. How to select sun-tolerant rhodies? Mulch should never be piled on plants. We have 3 PJM Rhododendron that were planted 2 years ago this fall. They have been watered by an irrigation system and fertilized yearly with HollyTone for acid plants. According to the University of Connecticut, there are at least seven known culitvars of varying size, spread flower and … Insect problems include aphids, borers, lacebugs, leafhoppers, mealybugs, mites, nematodes, scale, thrips and whitefly. Azaleas can regrow after a lot of pruning. Proper soil preparation is also necessary for the health of this acid loving plant. Rhododendron is one of the […] Rhododendrons and azaleas need their cultural requirements met. The problems usually occur when there is snow on the ground, especially when the ground is frozen solid. And be about 2-3 '' deep shallow rooted plants that need good drainage to perform.. 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