There are plenty of natural cat repellent solutions that you can use when you want to protect a certain area from cats. For instance, you can use an indoor cat spray that is formulated using natural ingredients. Similarly, you can make your own spray at home by combining equal parts of water and apple cider vinegar.
Lemongrass, peppermint, or lavender oils can also be used to deter cats. If you decide to make a natural spray at home by using these oils, you can use one-part oil, and three parts water. Another alternative is to plant lavender or rue plants along the flowerbeds in your garden.
You can also use tap water, aluminum foil, or double-sided tape as an efficient cat scratching deterrent solution as well. Other alternatives such as ultrasonic devices and spiked mats are also safe and they will not cause serious harm to your cats.