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How to keep a cat out of potted plants
Use stones or rocks.
If you're struggling to keep your cat out of potted plants, a barrier method may be your best option to keep him out of the soil. Some owners find using rocks or stones can be a fun, aesthetically pleasing option.
Lay the rocks around the base of the plant, making sure not to crush any stems or dig up the roots. When you water, the water should easily slip through the cracks of the rocks and get through to the soil.