On 6 Jun 2004 09:31:17 -0700, (Lil) wrote:

We've been living in this house for about 2 years. Recently, we
noticed that some neighborhood cat has been using our vegetable/fruit
garden area as a litterbox.

Go to Google groups and search rec.gardens and uk.rec.gardening for
"cats". You will find thousands of posts with practical suggestions,
as well as a lot of nasty ones.