Nothing, repeat, nothing, will stop a cat fouling your garden if it has a
mind to. The coleus Canina is not liked by cats, but they will move three
feet or so away from it and foul there instead. You could carpet your garden
entirely with it, but who wants that?
All of which IMHO are either unsightly, impractical or simply do not work.
Cats either ignore them, dislike them but get over it, or they need
replacing every time it rains etc. ( a big downside in UK)
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