Essential oil of Lilac is an oil that contains the chemistry essence of the lilac flower. The adjective “essential” used with the noun oil does not carry the common meaning of the word, i.e. “to be absolutely necessary or extremely important.” Instead, essential means to contain the essence of lilac. Essential oils contain the scents of the flower. Some would disagree that color, not scent, is the essence of a flower. However, both color and scent are used by the plant to attract insects for pollination. The scent of flower is directly attractive to human and also instinctively associated with spring growth and plant reproduction, because soon after the smell of flowers come the seeds and harvest of the plant for human consumption and survival during the history of mankind.