I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
Your hibiscus problem could be either dry or soggy wet soil as both can kill roots and result is similar top growth symptoms. Dig down a few inches and fill the soil to see what its true moisture content is. The only other thing that comes to mind is some type of physical injury to the roots. If it is a new transplant it may just be trying to recover from the problem and get roots established so it is more resilient.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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