What is the most inexpensive way to keep unwanted cats off your property?

One of the most inexpensive ways to deter unwanted cats is to use natural repellents, such as citrus peels, coffee grounds, or vinegar, which cats typically dislike. Additionally, creating barriers like chicken wire or planting cat-repellent plants, such as rue or lavender, can help keep them away. Regularly cleaning up food sources and securing trash can also minimize their attraction to your property.