- Written by Robbi Hoy
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Helpful tip from The Garden Geeks: Never, ever use motor oil, kerosene or gasoline as an herbicide. They may kill weeds, but they stay in the ground for years and can leach into drinking water. Remember - 1 gallon of oil can pollute a million gallons of water. You may end up poisoning more then the weeds, you may hurt yourself or your family.