Each of us knows from our own experience that a spring meadow full of flowers, greenery, and fresh grass makes us feel joyful and optimistic. There is a desire to run and laugh. A walk in the forest after rain calms you down, relieves even the most severe nervous tension, and in the evening ensures healthy sleep. A bouquet of fragrant flowers in a room is calming. In nature, there are many plants that contain essential oils and thereby have a positive effect on human condition and health. The book contains a list of essential oils, including their scope of use and effects on the human body.