From generation to generation, the knowledge about the potential of plants and their use was passed. To systematize this information is something that still needs to be done, to guide many research that, lacking today, of biological material. It is necessary to create some bridges, that can connect the research institutes with the community that makes use of the plants throughout the centuries. Another point that deserves attention in this process is that the knowledge about medicinal plants has been lost unnoticed. But this is a complex problem of being evaluated, due to the mobility of the people, in his work BRASILEIRO et al., (2006) brings that the disinterest on the part of the new generations is another factor that entails in the loss of the popular knowledge on the medicinal plants . The aim of this article was to recover the traditional knowledge about medicinal plants from the backyard and to diffuse the method of reproduction of seedlings in public school classrooms. Five classrooms, eighth and ninth grade, were chosen from the State School Professor Catarina de Abreu. A project was created in the science discipline, which covered the third and fourth bimester of 2016. In the third bimester the students were called to elaborate a work on composting. They were also instructed to bring a series of recyclable materials to produce, for each student, three vines for planting seedlings. The students were also instructed to map in their neighboring neighborhoods that had seedlings of roses. As a result, ingredients such as eggshell powder, coffee grounds, chopped styrofoam and earth were added in the schoolyard, collecting different types of soils, stones and sand. After all the mixed ingredients, the seedlings were planted and stored in a cool place under the sun, being watered every day. Every fifteen days the students visited the site and were measured the shoots and analyzed the losses. The results were discussed in the classroom after each visit, and a technical report was requested to each student, with note weight. As a result it was found that, students learned to make substrate with accessible and nutritious ingredients to produce fruit, vegetables, flowers, medicinal plants, etc. They learned systems of seedling reproduction, by cutting and planting seeds. They learned a method of rooting production from bean seeds and in discussion wheels in the classroom, and the importance of plants in the organism as agents of life generation was discussed. In the classroom, one can construct, from this project, a bridge between the knowledge acquired in the post-graduation and the intrinsic knowledge that each student possessed. One of the results that deserves to be highlighted is the curiosity that was aroused and revivified in each of the children who participated in the project, translating the teachings of Paulo Freire, who brings in the work of pedagogy of autonomy, the construction and reconstruction of knowledge as part of a liberation process (FREIRE, 1997).BRASILEIRO, B. G.; PIZZIOLO, V. R.; RASLAN, D. S.; JAMAL, C. M. Antimicrobial and cytotoxic activities screening of some Brazilian medicinal plants used in Governador Valadares district. Revista Brasileira de Ciências Farmacêuticas, São Paulo, v. 42, n. 2, p. 195-202. 2006.
FREIRE, Paulo. Pedagogia da Autonomia: saberes necessários à prática educativa. SP: Paz e Terra, 1997.