Forsythia
Why would you want one? Cats rarely stay in one place for long.
We have about five who think the garden is their lavatory. They follow the same route around it as far as I can see, including up onto my deck, peering into my French door, and then off the other side of the deck. At this point, if they didn't make such a smell in the garden, I would talk to them - but they do. I have found stuff that keeps them off the borders but it's madness to keep paying for it if I can find a more permanent solution.