I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
I am not aware of a good way to keep the cat from laying in the shrubs. Fencing is an option but not a good one I'm sure. There are sprays sold online that reportedly repel pets and some folks claim this works for mothballs scattered about. You'd have to try that one to see whether or not it works as claimed.
Thanks for the question. Best wishes for a wonderful gardening year in 2007. Please stop in again soon!
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