Johnny's sells Maine Certified Seed Potatoes. Seed potato certification is a rigorous process that includes field inspections throughout the growing season to check for disease and ensure that varieties are true to type. In addition, a winter grow-out of the seed is done to check for any disease contamination. Organic seed potatoes are also produced with certified-organic growing methods. We cannot ship potatoes outside of the U.S. or to U.S. territories. Order early to ensure availability.