Answer: It's really difficult to diagnose a plant problem without actually seeing it. In your case, we may really have to put on our detective caps and look at everything that might affect your cape honeysuckles. Start with sunlight exposure. Any changes? How about excessive heat or unseasonal heat and drought? If you've ruled that out, has anything changed in the way you water or your source of water? Has the drainage changed over the past few months? (New retaining wall, sidewalk, change in grade anywhere near your honeysuckle plants?) How about fertilizer or herbicide, insecticide applications nearby? Have you inspected your plants for insect infestation? (check upper and lower leaf surfaces and stems).
If you've ruled out all these possibilities, you may need to take a sample of stems and leaves to your local Cooperative Extension office where they can inspect the plant parts under a microscope.
Best wishes with your cape honeysuckle plants!
Q&A Library Searching Tips