 In addition to produce grown at farms, the district has a Garden to Café program which allows schools to be certified by the San Diego Department of Environmental Health allowing the school to grow and serve their own produce.San Diego Unified School district is the second largest school district in California and the largest in San Diego County.The district covers most of San Diego with the exception of San Ysidro, which is served by San Ysidro Elementary School District and Sweetwater Union High School District.