90-100 Days. Rio Grande Blue corn’s origins trace back to varieties grown by Native Americans in New Mexico. Blue corns, on average, have 20% higher protein content, more antioxidants, and a lower glycemic index than standard corn. Hang the 10"–12" ears to dry for a beautiful autumn display then save them to make delicious meals as the weather turns cooler. Recipe inside for chocolate atole, a traditional warm beverage served during the Mexican holiday, Dia de los Muertos.