Castor Bean (Ricinus communis): Ornamental Drama and Ricin Risk

Castor bean’s huge, tropical leaves make a bold statement in Southern landscapes, but its seeds produce ricin—a potent toxin. The plant dies back at hard freeze but often returns from seedlings.

Identification

• Large, lobed, glossy leaves on stout stems.
• Spiny seed capsules.
• Seeds: M&M-sized, speckled brown, tick-like (Ricinus = “dog tick” in Latin).

Safety

• Keep away from children and pets.
• Wear gloves when handling seeds or cut stems.
• Deadhead before capsules mature if concerned about volunteers.

Grown for drama, not dinner—respect the chemistry.

Castor bean seed