Poison  Oak is a fast spreading  sun loving shrub. It grows to about 5 to 7 ft high and can spread both via aerial suckers and by climbing up tress. The leaves are three pointed and have serrated edges on the leaf edges. The plant is a beneficial shrub for wildlife  but is dangerous for humans  as the leaves are poisonous and can cause a very itchy rash to develop. The prefer full sun and need some water in the winter  to keep the leaves green.