How big does poison ivy grow?

Answer 1

Poison sumac [Toxicodendron vernix] may reach a mature height of 7 meters [20 feet]. The plant contains the same urushiol oil that's the hallmark of poison ivy [Toxicodendron radicans] and poison oak [Toxicodendron diversilobum, and Toxicodendron pubescens]. But the allergic reaction that it may cause in humans is the most extreme of the three plants. In fact, many botanists rank poison sumac among the most toxic of plants in the United States of America.

Answer 2

Poison ivy can grow as tall as a tree. That is because poison ivy can be in identified in two forms: bush or vine. A poison ivy vine can creep up a tree and sometimes this kills the tree. The bush form can be as high as a doorway. The bush form will grow among other plants ( like your outdoor garden!) or at the edge of fields.