The connection between animal and plant has ancestral origins. The man himself, in prehistory, used to pick flowers, fruits, herbs, roots, berries and buds in accordance with his needs. A prehistoric ability, that man has lost nowadays or better saying, he has evolved, but it is own of cats and dogs. Suffice to say that dogs eat grass, in response to a physiological need.
Phytotherapy, although not from the beginning called by its own name, has crossed through the centuries and has faced several civilizations over the history. The Egyptians had extraordinary knowledge of plants and their balsamic oils, which priests used in many functions like antifungal, anti-fermentation and antioxidants. This can include their abilities, through natural principles, to mummify and preserve the bodies over the years.