Homemade mole repellent is formulated by first mixing 6 ounces of castor oil and 2 tablespoonfuls of dish soap or Murphy's Oil Soap in a gallon of water, explains Nikki Phipps, writing for Gardening Knowhow. During application, an ounce of this blend is used for every gallon of water.
Homemade mole repellent should be reapplied after watering or rains, explains Phipps. Other natural methods of mole control include minimizing water usage, as excessive amounts result in mole tunnels rising closer to the surface, and ridding lawns of grub worms and other sources of nourishment.
An alternative mole control method involves cultivating certain repellent plant species, explains Phipps. These include fritillarias, alliums, daffodils and marigolds. Castor bean plants, which contain castor oil, and mole plants may also be effective, but these should not be cultivated in an area frequented by children or pets because of their poisonous nature.
Harsher methods of mole control include chemicals and traps, explains Phipps. Traps are best used during spring and fall when mole activity peaks, and they should be set near actively used tunnels. Early spring is particularly ideal as female moles are usually pregnant. Chemical repellents are also highly effective, but they are not always the ideal choice because they pose a danger to pets and children. Chemical repellents may also poison the soil and the area surrounding the point of application. For these reasons, they should only be used as a last resort.