Farmer Geronimo Blanco shows his quinoa plants in Patamanta, Bolivia, in February. A burgeoning global demand for quinoa has led to a threefold price increase since 2006. Juan Karita/AP hide caption

itoggle caption Juan Karita/AP

The seeds of this goosefoot plant are known as quinoa, a superfood now in high demand and grown almost exclusively in South America. But some growers think they have the formula to grow it up north. Janet Matanguihan/courtesy Kevin Murphy hide caption

itoggle caption Janet Matanguihan/courtesy Kevin Murphy