I have heard that citrus peels and chicken wire will keep cats from doing their business in your flowers. I ♥ cats but not so much when they pee and poo in my yard - boo. DON'T use hot peppers. I have read that they cause serious harm to an animals eyes and that animals have clawed their eyes out due to the burning. I have never personally experienced this but it seems reasonable and it wasn't from the PETA site or anything. It was a legit site that escapes me right now.
