I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
Old cypress trees will produce those knees wherever the soil is soggy wet or poorly aerated. Putting such areas and to a groundcover is a good way to avoid having to mow over the knees. It will also help to not overwater the soil were to take other steps that improve the drainage in that area.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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