According to EU Regulation Member States must classify wine grape varieties planted in their territory for the production of wine or refined be allowed to. These must be of the European species Vitis vinifera or from a cross of this species with other species of the genus Vitis (eg the Asian Vitis amurensis or the American Vitis labrusca ) come. Six grape varieties are prohibited, although they meet these conditions. These are Clinton. Herbemont. Isabella. Jacquez. Noah and Othello, Why exactly these six have historical reasons, which today also no one knows or can explain from official side any more (one of the secrets of European Union laws).