Fresh spinach that sparked a nationwide E. coli outbreak last fall was grown on a roughly 50-acre plot in San Benito County, health officials told state lawmakers.

Officials said at a legislative hearing Tuesday that investigators identified the grower who was farming that plot, which was in the second year of a three-year transition to organic production.

However, they declined to release further details until they complete a full report on the outbreak. Dr. Kevin Reilly of the California Department of Health Services did not give an exact date for releasing the report with the U.S. Food and Drug Administration, but said "hopefully within the next few weeks."