CASTLE ROCK, Minn. — The farmers got off the yellow school bus and walked into the field of waist-high Kernza, a perennial wheatgrass that someday could undergird breads to beers across the nation.
One field-walker wears a "You had me at deep roots" T-shirt and another points out elderberries in a ditch.
Passerby could mistake the waves of Kernza for a bluestem prairie, save those small but powerful kernels of grain.
