Like some nefarious version of the three sisters, poison ivy, poison oak and poison sumac have loomed in the minds of every gardener and outdoor adventurer. These species, containing the urushiol ...

(WBOY.com) — The official start of summer is nearing, which means more will head outdoors to go hiking and camping. The Volunteer State is known for its natural beauty, and while it’s worth ...

Poison sumac is a type of plant that can cause an allergic skin reaction, such as a rash that may be itchy or swollen. Poison sumac is a woody shrub that grows up to 20 feet tall. Its branches have 7 ...

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Poison ivy, poison oak, and poison sumac all contain urushiol, a toxic oil that triggers an allergic rash in most people 12 to 72 hours after contact. Urushiol can spread from contaminated clothing, ...

Poison ivy, oak, and sumac contain an oil called urushiol that causes an allergic skin rash. These plants can be identified by their leaf structure, though some non-toxic plants look similar. To avoid ...

Tom Oder is a writer, editor, and communication expert who specializes in sustainability and the environment with a sweet spot for urban agriculture. John Manion is a guy who know his plants. That's ...