I Must Garden Mole & Vole Repellent has a super strong formula containing 20% castor oil, mint and cedar oils. Castor oil makes the animals’ food smell and taste bad and causes digestive upset. Mint oil is an irritant to the rodents’ nasal passages and cedar oil repels insects that moles eat. The combination of ingredients makes for a powerful, effective and pleasant smelling repellent. Safe for people, pets and the environment. Also repels gophers, skunks, chipmunks, ground squirrels and other burrowing animals.