Oleanders are evergreen shrub trees that are known for their poisonous qualities. However, these are used for medical purposes. These plants bear flowers and long seedy fruits. These trees have saps that contain white milky liquid that can cause a lethal or near lethal toxic reaction in humans as well as animals. Although these may be dangerous for humans and many other animals including livestock, horses etc they still happen to main a good ecological system as caterpillars feed on them. These mostly used for decorative purpose and their sweet smelling flowers are used for creating ornaments.