The sagueso, a columnar cactus even larger than the saguaro, is discov ered outside its natural range in Sonora, Mexico. How did it get there ? Could the Seri Indians have planted and cultivated it hundreds of ye ars ago? In search of the answer, this program goes on an ethno-botani cal journey along the coast and mountains of western Sonora, where the cactus is still the lifeblood of modern-day Seri Indians. We also vis it the Seri people, who invite us to join them for a sagueso harvest.