I have tried two things lately, Birdfeeder which seem to be working so far.....
In two areas of finely dug, bare soil I had regular cat visits at night.....
I laid a length of hose, about three feet, in each area......and in the larger area I "planted" some unwanted CDs edge on.....
I won't keep them there for long but they seem to be working and training the cat/s to go elsewhere...
My mother put clear plastic bottles half filled with water on her lawn when she had a problem with cats on the lawn.........x