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!
If I understand your question correctly I would suggest you try a row of ornamental clumping grasses such as one of the Miscanthus. They are great for slowing water runoff and preventing erosion.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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