castor oil granules
Do castor oil granules work to repel vole/gophers, etc? f so. what kind works best? Ron
Certified GKH Gardening Expert
Yes, and this will be a specific product. A google search of Castor oil granules will take you to many results that will work just fine.
This article will give you more ways to control these: https://www.gardeningknowhow.com/plant-problems/pests/animals/mole-control.htm