As the owner of 3 (admittedly cat-sized
) dogs, the litter tray is not my natural habitat but I need cat advice so I appeal to you experts....
...a local cat has taken to using my front garden as it's litter tray. I have a very narrow flower bed, about a foot wide, running parallel to the path and that is where it is pooing and not burying the poo. The first deposit I found while gardening - without gloves -
It has since reused the spot several times and today was an especially smelly, soft example (sorry if you've just eaten).
Now, being the owner of dogs I am completely comfortable with picking up poo, I pick up a lot, but obviously I'd prefer not to have to pick up other people's animals, and I'd prefer people not to be wondering what the small is when they walk up to my house! 
Anything I can do to deter it? I have no idea which of the local cats is the offender and can't easily see the front path so I can't be spraying it. Is there anything I can put down or grow to discourage this?