The History of Poison Sumac

Our first crossover episode this season with Dr. Matt Candeias of In Defense of Plants stars everyone’s favorite irritating plant-originated substance: urushiol! Join us for a light-hearted deep dive into urushiol, aka the stuff in poison ivy that makes you soooo itchy/burny/scratchy. Have you ever wondered why popping a benadryl doesn’t relieve those oozing, raised welts all over your gardening arms? Or whether a poison ivy rash has ever been used as evidence in a murder case? Or why poison ivy and other plants produce this substance in the first place? Don’t worry, just like a poison ivy rash after a summer gardening sesh, we’ve got you covered.

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