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The seeds of the castor bean are among the deadliest on earth, and they are hazardous to both people and pets. While some varieties are intentional additions to ornamental gardens, castor bean also grows as a weed that can reach 15 feet tall. The main toxin in the castor bean seed is ricin, which has been used as a chemical or biological warfare agent. Avoid growing it at home if you have pets or children.
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