false sunflowers with black substance
My false sunflowers get a black, almost wet or greasy, substance that appears to be bugs when closely inspected. What is this? And this occurs on the stems. How do I deal with this problem, as it happens every year? Thanks.
Certified GKH Gardening Expert
Most likely Sooty Mold. Neem Oil is a good treatment.
Here is a link that will help.