Production Once harvesting is complete, the member farmers deliver their produce to the Winery, where it is tested, graded and separated into cultivars in large receiving bins. From here they are destalked and then undergo drainage and purification before the juices are transferred to fermentation tanks where appropriate yeast strains are added. The must in the tanks is tested regularly and once fermentation has reached the correct levels, the process is stopped. Selected cultivars are then transferred to wooden vats for maturation. This all happens in Swartland Winery's cellar which is being upgraded at present.