USDA says small farms are becoming more popular even as large farms grow
                                
                                
                                    (Newser) -
                                    Most evenings, Gary Mithoefer can be found at the end of a long gravel driveway off a busy highway, tending two garden plots filled with white sweet potatoes, squash, cabbages, and a dozen other vegetables still thriving in early fall. The 62-year-old, who gardens after his workday ends at his...