'Because of their sensitive noses, cats don’t like peculiar smells like lavender, cinnamon, citrus peels, coffee grounds, vinegar, or peppermint,' says Richard Mann. 'Mix some of these with water and spray the mixture around your garden.'
Using scents like these to naturally repel cats so they aren't encouraged to stay and go to the toilet is really helpful. You can also buy dedicated cat repellents, which will use non-harmful chemicals to keep felines away.