Does Poison Sumac grow in Southern California?

Poison sumac (Toxicodendron vernix) typically does not grow in Southern California, as it is usually found in wetter, more humid regions, primarily in the northeastern United States and parts of Canada. In California, the more common poisonous plants are poison oak and poison ivy. While poison sumac prefers swampy areas, the climate in Southern California is generally too dry for it to thrive. Therefore, residents in Southern California are unlikely to encounter poison sumac in their local environment.