 Though expensive to install, this method provides for the maximum level of control by the vineyard manager to facilitate yield control and increase potential quality in the grape by leveraging water stress on the vine.While there is some wine production in the provinces of Buenos Aires, Córdoba and La Pampa, the vast majority of wine production takes place in the far western expanse of Argentina leading up to the foothills of the Andes.The Mendoza region is the largest region and the leading producer, responsible for more than two-thirds of the country's yearly production, followed by the San Juan and La Rioja regions to the north.