The effectiveness of the teaching-learning process relies on the role played by the students as the main characters in this process. The experience shown in this work is focused on getting them closer to their environment. To do this different activities have been proposed such as gathering and classifying plants, writing index cards, making ethnobotanical inquiries, and laboratory experiences. As research work has also been done: different leonardo’s texts, related to the use of plants during his century, have been read. This information has been compared to the use of plants today. Apart from enhancing their interest in their environment other main objectives are the following: the improvement of their scientific behaviour, the cooperation with other students and the respectfulness with other ways of thinking.