Temo: Moth Balls.. sounds like they do the trick..
but if some of you may just not be aware of.. aren't they poisonous?? If you have small children around.. or that can access the area you are trying to maintain.. you may wish to use the smell of citrus to keep the kitties out.. Orange rinds or Lemon peels.. just squeeze the peels onto the dirt the oils will help deter the pesky kitties.. you probably could even bury the peels..