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Local legislation often dictates which varieties are selected, how they are grown, whether vineyards can be irrigated and exactly when grapes can be harvested, all of which in serves to reinforce tradition. Changes in the law can also change which grapes are planted. For example, during Prohibition in the U.S. (1920–1933), vineyards in California expanded sevenfold to meet the increasing demand for home-brewing. However, they were largely planted in varieties with tough skins that could be transported across the country to home wine-makers and the resulting wine was of a low quality.
According to the International Organisation of Vine and Wine, in April 2015, China () overtook France () in terms of land devoted to vineyards, in second place behind Spain (), the world's largest producer.
vineyards in California