It is difficult to know what the cause might be based only on those symptoms. It could be due to poor soil drainage (soggy soil conditions) or due to a disease organism. . I suggest that you take a sample from the plant along with a photo of the plant in its growing location (if possible) to your County Extension Office to see if they can help diagnose the problem and recommend an appropriate course of action. Their contact info is:
1303 17th Street West
Palmetto, Florida 34221
Phone: (941) 722-4524
Thanks for the question. Please stop in again soon!
Q&A Library Searching Tips