Farmers Alberto Gómez, José Castillo and Javier Castillo arrive with their selected seeds, stored in shigras hand-woven shoulder bags " as has been done for generations. In San Lorenzo, they call themselves "seed guardians" for their role in protecting this living heritage and passing it down the generations. [They] are among the farmers supporting draft legislation, under review by the lower house of the Colombian parliament, that would ban genetically modified (GM) seeds, which they claim threaten their traditions, livelihoods and food sovereignty. The initiative has the backing of Indigenous, peasant and environmental organisations, but faces opposition from agribusiness and sectors that support GM. In San Lorenzo, the rejection of GM seeds evolved into organised political opposition after people detected the use of such seeds in nearby crops in 2012. They then feared that GM seeds might cross-pollinate with their native varieties, altering their traits and threatening their ability to preserve them. The alarm prompted them to act. They travelled from village to village, hosted workshops, collected 1,300 signatures and drafted a citizen-led proposal. The initiative was backed by the Seed Guardians of Life Network, a national platform comprising farming and environmental groups, as well as local collectives and the municipal government. It was formally submitted to the town council. In 2018, San Lorenzo declared itself a GMO-free territory.