The project aims to demonstrate that some easy actions make it possible to convert a school building into a totally green school. Very young kids from European schools will collaborate to learn more about local and extra local plants. Plants can contribute to the purification of indoor air: school gardens will be an educational garden: seeds from different Countries will be planted and cultivated, to build a European garden. Students in the early years of their education will learn to live with plants and to draw all possible benefits from their company; not only environmental, but also physical and psychic. The project will include STEAM activities, such as conducting science experiments with plants; it is an easy way to incorporate hands-on experiences to school curriculum.