Furthermore, these aromatic characteristics of essential oils may provide various
functions for the plants itself including; attracting or repelling insects (odors of the flowers); while in plant metabolism, a few essential oils might involved in this process; Leaf oils, wood oils, and root oils may serve to protect against plant parasites or depredations by animals as well as anti-bacterial agent which is utilizing the hormone in the oil. There are only about 700 plants are considered aromatic among all types of plants in the world thus they are all important for the production of essential oils.