When the squirrel population is too high and they head for my garden the first thing I do is get some blood meal and sprinkle it around and on their favorite target plants until I can thin out the worst offenders. It really repels them until it rains heavily then it needs to be reapplied. I am not sure how effective it is on chipmunks but they seem far less bold than squirrels so I assume it would work even better with them.
Bill
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