The 9th Organic Seed Growers Conference drew more than 400 participants in Corvallis, Oregon, from February 14-17, 2018 and an additional 200 people joined the conference via live webinar. Participants represented 31 U.S. states, 9 countries, and 18 universities. Conference co-hosts included Oregon State University, Washington State University’s Food Systems Program, and eOrganic. The conference proceedings available here include more than 30 papers from the more than 70 speakers on a wide array of topics covering seed growing, plant breeding, policy advocacy, seed economics, and the conference theme, “synergy that sustains.”