Growing organic winegrapes is not a whim or a move that should be made impulsively or taken lightly. One of the biggest mistakes that growers make when moving from conventional to organic farming is converting the whole operation at once, without a well-researched plan and a clear idea of the extra time and costs involved. Kelly Maher, a consulting vineyard manager in Saint Helena, California, encourages people to start gradually and add acreage bit by bit. "We manage five ranches," Maher said....