Castor oil granules do not actually harm the moles, which eat grubs and earthworms.They actually act as an irritant to the moles, driving them away from the treated part of your lawn.Typically, they are spread over the affected area of your yard and are either watered manually or naturally...
take away their food source. They are known to eat a lot of insects and things like grubs and ants. If you want to get rid of moles, try treating your lawn for these things, and see if they come back in the spring.