My method has been to balance empty glass bottles upside down against the back of the pots, a makeshift alarm so if anyone tries to take one I can jump out and give them a good old earful! (although it does make you paranoid everytime you hear a glass bottle). Not had any thefts since I set those up.
Theft of Patio Planters and Containers
How do you prevent patio containers from being stolenJump to latest post
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