I tried lots of things, including windmills, bottles and garlic, but none made any difference in my garden. The moles just pushed the bottles out of the grounded again!
Moles might be solitary creatures for some of the year, but having caught 18 moles in two months in my not very big garden, many in the same holes (and even two in one trap one day), I can assure you that there can be many moles in a small area when they are breeding.
Also, it is often only a matter of days (sometimes only hours) before a very recently vacated tunnel will start being used by another mole.
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