Query Mill Hill Farm Add to favorites We grow organically on 1 1/2 acres, but are not certified. We emphasize American heirlooms and special European and Asian varieties. Our heirloom tomatoes, season-long lettuce, and multitude of greens are special. We grow everything except tree fruits. Farmers market vendor at the Rockville farmers market. CSA – May – October Tweet Our address Address: 13231 Query Mill Rd, North Potomac, MD 20878 GPS: 39.073733, -77.284764 Telephone: 301-926-8602 Hours of Operation May - November Saturday: 9a.m. - 1p.m. at the Rockville Farmers' Market Additional Information Operating Acres: 1.5 Opertaing Since: 1980