Courtesy of High Mowing Seeds viability Courtesy of High Mowing Seeds Some types of seeds naturally last longer than others one from the High Mowing Seeds Seed Viability Chart one from the High Mowing Seeds High Mowing Seed Viability Chart Seed Viability Chart http://www.highmowingseeds.com/blog/seed-viability-chart/ how long each type is usually viable check out this great chart from High Mowing Seeds check out this great chart from High Mowing Seeds how long each type is usually viable