Gardening

I want to have a container garden...I have that patio space, but I need to find a way to deter these foul ass cats running around (they're like junkyard cats, around mainly to control the rat/mouse population). I don't need them mucking up my organic garden with their viral nastiness (yes I am not a cat person, and definitely not a non-domestic domestic cat). Any suggestions? I just want to plant tomatoes, and maybe some cukes (or squash).