Poison Oak is a plant that can cause skin irritation and allergic reactions in many people. It typically grows as a shrub or vine and is found in the western and southeastern United States. The leaves are usually grouped in clusters of three and can have a glossy appearance, turning red or orange in the fall. When touched, Poison Oak releases an oil called urushiol, which can lead to rashes, itching, and blisters. To avoid contact, it's important to recognize the plant and wear protective clothing when hiking or working outdoors in areas where it may grow.