Single Malts Scotch is single malt whisky made in Scotland. To be a single malt scotch the whisky must have been distilled at a single distillery using a pot still distillation process and made from a mash of malted grain. In Scotland, the only grain allowed to be used in a single malt whisky is barley. As with any Scotch whisky, a single malt Scotch must be distilled in Scotland and matured in oak casks in Scotland for at least three years. "Malt" indicates that the whisky is distilled from a "malted" grain. Several types of grains can be malted, however, in the case of single malt Scotch, barley is always the only grain used. "Single" indicates that all the spirits in the bottle come from a single distillery. Bottlings containing malt whisky from multiple distilleries are called "Blended Malt".