Raccoons can be a nuisance for gardeners, especially when they target outdoor plant boxes. To protect your plants, you can create an effective raccoon deterrent system using simple, humane methods.

1. Physical Barriers: Install wire mesh or chicken wire around your plant boxes. Raccoons dislike the texture and will avoid digging.

2. Natural Repellents: Sprinkle cayenne pepper, garlic powder, or vinegar around the plants. These strong scents deter raccoons without harming them.

3. Motion-Activated Devices: Use motion-activated sprinklers or lights. The sudden movement or noise will scare raccoons away.

4. Ultrasonic Repellers: These devices emit high-frequency sounds that are unpleasant for raccoons but inaudible to humans.

5. Secure Lids: If your plant boxes have lids, ensure they are tightly secured to prevent raccoons from accessing the soil.

By combining these methods, you can create a robust raccoon deterrent system to keep your outdoor plant boxes safe and thriving.