A helpful old saying is “leaves of three, let it be,” according to the U.S. Centers for Disease Control and Prevention. But poison oak may have more than three leaves, and depending on the ...

The plant can grow up to 14 feet tall with 5-foot-wide leaves and 2.5-foot-wide ... This woody shrub is in the sumac family and like poison ivy, poison oak produces an oil called urushiol that ...

Its leaves also have saw-toothed edges, unlike poison sumac. While poison sumac likes to grow in wetlands, most other sumacs prefer drier areas with well-drained soils. Poison ivy and poison oak ...