Mountain plants, as varied as they are, have always had, beyond their pleasant aesthetics, a usefulness for man. Since the latter has invested the massifs, he has had to focus on the plants to feed himself or to heal himself. Whether it is in the Alps or the Pyrenees, we will understand which plants are edible, how to cook them, what are the plants with medicinal qualities,… We live at the time of the return to nature, the mountain plants are the main actresses. They are also, through the film, the witnesses of global warming. Enthusiasts or naturalists alert us, by their testimonies, on the consequences of the action of the man on the plants of mountain.