In a context where sustainability is becoming increasingly essential, cover crops (CC) are emerging as a recommended and often necessary practice. Grown between main crop (MC) cycles, they can significantly reduce or even eliminate the need for chemical fertilisers when properly managed. Leguminous species, such as Melilotus, are particularly effective in nitrogen (N) fixation, with recorded contributions of up to 238?kg/ha of N in potato systems (Griffin & Hesterman, 1991). Beyond nutrient management, CCs reduce soil erosion, increase organic matter, suppress weeds, and enhance biodiversity—often without increasing pest or disease pressure, and in some cases, even reducing it. However, their success depends on appropriate species selection and timing. Poor variety choices can increase pest risks, and misaligned sowing dates may interfere with MC cycles. Ultimately, cover crops are not just a technique but a multifunctional strategy that regenerates soil, reduces input costs, supports biodiversity, and contributes to a more resilient and sustainable agricultural system.