I have a gentle bank of azaleas in my backyard. Some have been there 18 years. While they continue to grow and flower each year, I have been losing a lot of branches from them in the last few years. They are not thick like they used to be. There is no sign of bugs or fungus. Is there something I can do to get them back to healthy looking plants? They look so spindly now.
Problem With My Azaleas Dying
Certified GKH Gardening Expert
Just in case, check this article for signs of botryosphaeria disease:
Also, the borers described in the article and in the following article would be inside the branches, so the presence of insects wouldn't be obvious from the outside:
Another possibility is that the azaleas are unhappy in their current conditions- for example, perhaps the soil pH is too high or they are in excessive sun, especially if something in their surroundings has changed in the last few years.