Why is my rhododendron so sickly
I have a large,generic rhododendron next to my house,and the plant is several decades old. It has always been healthy and blooming,and I pruned it occasionally tincontrol its height. Last season I noticed dieback,woodier looking branches, and overall a less healthy plant. I pruned back some branches but that doesn’t seem to have helped. I used composted leaves as fertilizer. I haven’t put any fungicide or chemicals on it. Could this be simply old age,would heavy pruning help or should I give up and start with a new plant. I filled this form out once already,but not sure it was sent, so this may be a duplicate.
New Castle County Delaware