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Castor Oil for Moles: Myth or Method?

No Scientific Support for Repellency

Castor oil won’t harm grass or shrubs, but research doesn’t back its mole‑repelling claims. Mole activity is highly variable; apparent success is often coincidence. Best approach: press down tunnels with your feet—moles relocate on their own.

About Gardening: Clarifying T.S.O. and S.O. Horticultural Oil Designations; Lawn Holes: Voles, Not Moles—Perfectly Round Holes Indicate Voles; Mole Repellents Don't Work—Trapping Does; Mole Control: Traps Beat Repellents & Indirect Methods; Effective Mole Control: Trapping Works, Castor Oil Doesn’t; Horticultural Oil: Buy, Don't Brew; Mosquito Repellent Plants Don't Work: Use a Fan; Controlling Moles in the Lawn; Motion-Activated Sprinkler (Scarecrow) Repels Cats from Gardens; Castor Bean: The "Mole Plant" – Toxicity, Uses, and Mole Repellent Recipe

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