Bush Vines The Cellar Master and viticulturist take a very hands on approach to grape production. By studying the natural conditions, they help assist the member farmers in determining the varietals to plant, test produce throughout the season to determine optimum harvesting time and keep everyone abreast of new developments in the wine industry. 85% of the vineyards are small bush vine and the average yield per hectare is just 7 tons as opposed to high yield trellised vines, but with close monitoring, the quality of grape is exceptional. Essentially, the drier conditions result in smaller grape berries that have increased levels of concentrated sugar, acid and flavor components, undiluted by excessive irrigation. The good gravel understructure of the soil promotes moisture retention and environmentally friendly farming practices assist in this process. For example, sowing grain in seeds between the vines during autumn binds the soil and provides protection from the winter rains. Valuable minerals and nutrients are prevented from washing away, and in spring, when the grain dies back, it forms a protective blanket over the soil, further reducing moisture loss during the long hot summers and also curbs the growth of weeds.