Seed Savers Exchange, or SSE, is a non-profit organization based in Decorah, Iowa, that preserves heirloom plant varieties through regeneration, distribution and seed exchange. It is one of the largest nongovernmental seedbanks in the United States. The mission of SSE is to preserve the world’s diverse but endangered garden heritage for future generations by building a network of people committed to collecting, conserving, and sharing heirloom seeds and plants, and educating people about the value of genetic and cultural diversity. Since 1975, Seed Savers has produced an annual yearbook of members’ seed offerings.