After giving a startup pitch at the October Midwest Cleantech Open and winning the regional sustainability award, Maplewood-based Garden Fresh Farms began preparing for the national stage. On Nov. 21, Garden Fresh Farms accepted the National Sustainability Award at the Cleantech Open Global Forum in San Jose, Calif.

“Congratulations to the 2013 winners and finalists, which represent the best in early-stage cleantech innovation and viable solutions to some of the world’s toughest challenges,” Rex Northen, executive director of the Cleantech Open, said in a statement.

Garden Fresh Farms was founded by entrepreneur Dave Roeser. The company is working to grow a network of inner-city, indoor hydroponic farms.

The Cleantech Open grand prize went to PowWow Energy, a California company that’s developed technology that can quickly detect water leaks on farms. These leads can destroy an entire crop, causing thousands of dollars of damage.