Some also offer professional training for sommeliers and winemakers. Early winemakers tasted the grapes to gauge ripeness. Before this change winemakers could only sell wine from hotels. Some winemakers practice natural wine making where no preservative is added. These old vines produce intense flavors allowing winemakers to make outstanding Zinfandels. German winemakers have recently begun experimenting with the grape. Walmart's Winemakers Selection private label wine was introduced in June 2018 in about 1,100 stores. In 1984, the first grapes were sold to local winemakers. About 130 different grape varieties are used by commercial winemakers in Australia. In response, the demand for Californian Chardonnay increased and Californian winemakers rushed to increase plantings. It proved popular with the local farmers, herdsmen, and "paysans-vignerons" (peasant winemakers) of the area. However some winemakers have begun experimenting with both. Botrytis has also been imported for use by winemakers in California and Australia. Some Washington State winemakers, such as Chateau Ste. Early Australian winemakers faced many difficulties, particularly due to the unfamiliar Australian climate.