Q:One of my PJM rhododendrons has yellow leaves while the other two have green leaves. The leaves on the yellow plant have dried up completely. What could be wrong? A:Rhododendron is an acid-loving ...

Is it a rhododendron or an azalea? It can be puzzling because all azaleas are rhododendrons, but not all rhododendrons are azaleas. Both plants are woody, rounded shrubs in the Ericaceae (blueberry) ...

Q: The leaves on my rhododendrons on the north side of my home in Northwest Arkansas are turning yellow and have brown spots [the reader sent a photo]. Do you have any suggestions to remedy this? I ...

We’re well into winter and that means spring and the gardening season is on the way. If you’ve got questions, turn to Ask an Expert, an online question-and-answer tool from Oregon State University’s ...

THERE’S A NEW pest in town. I’ve been receiving more and more questions about an insect that is ruining the appearance of rhododendrons and azaleas. If you’ve noticed that the leaves on these plants ...

The Arnold Arboretum of Harvard University discovers and disseminates knowledge of the plant kingdom to foster greater understanding, appreciation, and stewardship of Earth’s botanical diversity and ...

Q: The leaves on my rhododendrons on the north side of my home in Northwest Arkansas are turning yellow and have brown spots [the reader sent a photo].