In the 1970s, the Japanese sociologist Kazuko Tsurumi developed endogenous development theory—the idea of ‘development from within’, which frames human wellbeing, ecological viability and community agency as central to sustainable modernisation. In this study of Tsurumi’s ideas vis-à-vis seed governance, Yoshiaki Nishikawa first traces the broader debate over seed systems, from polarised stances such as traditional vs modern to more nuanced mixed approaches. Nishikawa shows how Tsurumi’s thinking on values, communication, local autonomy and tradition can illuminate understanding of humanity’s relationship with seeds across cultures and regions. Many farmers, for instance, consider crop diversity and seed production as naturally integral to their stewardship of local ecologies, rather than politicised acts of sovereignty. Wise governance is based on an understanding of seeds as a biocultural legacy, and ensures that autonomy and respect are interwoven in the concept and practice of seed sovereignty.