Castor Bean: The "Mole Plant" – Toxicity, Uses, and Mole Repellent Recipe

The so-called "mole plant" seeds are actually castor bean (Ricinus communis). While this plant features dramatic, tropical-looking foliage, its seeds are extremely poisonous—they contain ricin, a potent toxin associated with bioterrorism concerns.

Castor Oil and Mole Control

Traditional castor oil, derived from the seeds, has a reputation as a mole deterrent, though scientific testing remains limited. One study did show a castor oil product successfully reduced mole activity. If you're dealing with moles, you can make your own repellent:

Homemade Castor Oil Mole Repellent

• Mix 6 ounces of castor oil with 2 tablespoons of liquid detergent in 1 gallon of water
• Dilute at a rate of 1 ounce of this concentrate per gallon of water
• Apply to 300 square feet of lawn

Important safety note: Keep castor bean plants and seeds away from children and pets. The ornamental value is high, but the toxicity risk is serious.