The leaves of my rhododendron, 40 years old, are turning yellow and dropping. What is the problem and what can I do to keep it healthy and producing flowers in the spring?
Baltimore County Maryland
Rhododendron may normally drop some old leaves as fall progresses. If it is dropping new leaves (from this year or last), then it may be a problem.
If there has been a change in its site, that could be the cause.
Keep an eye on it. Here is a diagnostic chart that may be helpful: https://extension.umd.edu/hgic/topics/diagnostic-chart-azalea-and-rhododendron-problems
For details about each problem, use the link to disease problems at the bottom of the page.
If you see any new symptoms, let us know and/or send photos.