Both of my gardenia bushes' leaves are turning dark brown/black. What can I do to save them? Are they dying? I live in Orlando, FL with plenty of rain and humidity right now. Please advise.
Gardenia Bush Care
Certified GKH Gardening Expert
This may be sooty mold. It happens when the plant gets a pest infestation. I would recommend using neem oil, as this will get rid of the sooty mold fungus and kill the pests. Here is some articles that will help you: