What happens next?

How to keep cats out of your yard
Use a cat repellent to prevent cat litter.
These mixes are the best option against cats that use your garden as a litter box, and are available at most pet stores and on the internet. Shake the granules or spray the concentration near garden beds that are used as litter boxes.
The cat repellent usually uses predator scents to scare the cat into finding a new territory. Choose a non-toxic formula to reduce risk of hurting pets, children or plants.