I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
There are repellent products on the market that claim to be unpleasant to cats. There is also a product called the scarecrow that is a sprinkler with a motion detector. When something comes into the area it blasts it with a brief machine gun burst of water. You can imagine what a cat thinks about that.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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