Mown meadows are agricultural ecosystems maintained by the age-old action of human beings that are now disappearing all over Europe, and with them a wide associated biodiversity. SOS PRADERAS aims to recover the traditional knowledge of mown meadows by associating it with modern tools to encourage their preservation. By means of collaboration between Spain, France, and Portugal the project will promote their assessment, their proper management, the application of agro-environmental subsidies, and the marketing of seed mixtures. These actions are intended to benefit farmers, entrepreneurs of the seed sector, and the general population.