Toxicodendron diversilobum aka Pacific Poison Oak

Toxicodendron diversilobum, also known as Pacific poison oak or western poison oak, is a woody vine or shrub in the Anacardiaceae family. It is widely distributed in western North America and can be found in various biomes such as conifer and mixed broadleaf forests, woodlands, grasslands, and chaparral. Peak flowering occurs in May. Despite its name, it is not closely related to oaks. Like other members of the Toxicodendron genus, T. diversilobum causes itching and allergic rashes in most people after contact by touch or smoke inhalation. It is notorious for causing significant and long-lasting skin irritations (allergic dermatitis) in humans. Although it is a rare houseplant, western poison oak is a fun challenge to grow and needs regular watering to thrive. It prefers long-lasting, direct light and well-draining soil. Repotting each time it doubles in size should provide enough nutrients, so added fertilizers are not necessary. Native to Northern Mexico and the Southwestern United States, T. diversilobum is a plant to be approached with caution.