Answer: In my experience, the most reliable prevention is a fence, but that won't stop squirrels. Some gardeners report success using repellent sprays, either home-made garlic and/or red pepper based or the commercial formulations of repellents of which there are a number. A pet cat or dog on patrol can be useful too in discouraging the intruders. Sometimes it takes a combination of methods to achieve acceptable results. Although moth balls have been suggested as a repellent many times over the years, they are no longer recommended due to the chemicals they release and potential dangers should pets or children ingest them. I hope this helps.
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