The particular GM crops Fraley pioneered at Monsanto have been profitable for the company and many farmers, but have not helped sell the cause of high-tech agriculture to the public. Monsanto’s Roundup Ready crops are genetically modified to be immune to the herbicide Roundup, which Monsanto also manufactures. That means farmers can spray the herbicide freely to eliminate weeds without damaging their GM corn, cotton, or soybeans. Their contract with Monsanto does not allow them to save seeds for planting; they must purchase its patented seeds each year.