Grain whisky explained
Grain whisky is the quiet partner in most blends. It is made differently from malt whisky, tastes lighter and sweeter and is starting to appear more often as a single grain bottling. Here is how it is made and what to taste for.
What makes a whisky grain whisky
In Scotland, grain whisky is whisky made from water and malted barley with other cereals added, usually wheat or maize. A small share of malted barley is there for its enzymes, which convert the starch in the other grains to sugar. The rest of the mash can be any cereal.
Most grain whisky is distilled in column stills, also called continuous or Coffey stills. That is the main difference from malt whisky, which in Scotland must come from pot stills. Our guide to the grains used in whisky covers how each cereal shapes flavour.
The column still changes everything
A pot still runs in batches. A column still runs continuously. Wash goes in near the top, steam comes up from the bottom and alcohol vapour climbs through a series of plates. Each plate acts like a small distillation, so the spirit coming off the top is much stronger and cleaner than pot still spirit.
The design most associated with grain whisky is the Coffey still, patented by Aeneas Coffey in 1830. It made large volumes of lighter spirit possible and is the reason blended Scotch exists in the form we know. Scotch rules cap the strength at distillation below 94.8% ABV, so the spirit keeps some flavour from its raw materials rather than becoming neutral.
What grain whisky tastes like
Grain whisky is lighter in body than malt and usually sweeter. New make from wheat tends to be soft and bready. From maize it is rounder and slightly oily. After years in American oak casks, grain whisky picks up a lot of vanilla, toffee, coconut and cream soda notes, because there is less spirit character competing with the wood.
Old single grain whiskies can be surprisingly complex. The cask has had a long time to work and the clean spirit lets every bit of oak show. Young grain whisky on its own can taste thin, which is why most of it goes into blends.
The backbone of blended Scotch
A standard blended Scotch is mostly grain whisky, with malt whisky added for character. The grain gives smoothness, lightness and volume. The malt brings depth, fruit and sometimes smoke. A blender works like a cook with a good stock: the grain is the base, the malts are the seasoning.
Scotch grain whisky obeys the same core rules as any Scotch: at least three years in oak casks in Scotland and at least 40% ABV in the bottle. When a single distillery's grain whisky is bottled on its own, it is labelled Single Grain Scotch Whisky.
Grain whisky beyond Scotland
Other countries make grain whisky too, often under different names and rules. Irish whiskey has its own grain whiskey category, usually column distilled from maize or wheat with some malted barley. Japanese distillers make grain whisky for their blends. American whiskeys such as bourbon are grain whiskies in the broad sense, but they follow their own rules on mash bill, still strength and new charred oak.
In India, many popular whiskies are blends that include neutral spirit made from molasses or grain. That is a different product again from Scotch grain whisky. Labels and rules vary.
Why grain whisky is cheaper to make
Grain whisky usually costs less to produce than malt whisky, for practical reasons rather than quality ones. Wheat and maize are cheaper than malted barley and give a good yield of alcohol per tonne. A column still runs day and night without the stop, empty and refill cycle of a pot still. One large grain distillery can make as much spirit as many malt distilleries together.
That efficiency is exactly why blends became affordable in the nineteenth century. It also explains why grain whisky was rarely bottled on its own for most of its history: it was the base, sold in bulk to blenders. Single grain bottlings, especially older ones, are a more recent idea and show how much flavour long ageing can give a light spirit.
How to taste it
The best way to understand grain whisky is to taste it beside a malt. Pour 20 ml of a single grain and 20 ml of a single malt of similar age into two glasses. Nose the grain first. Look for vanilla, cereal sweetness and soft fruit. Then nose the malt and notice how much more weight and texture it has. Add a few drops of water to each and compare again.
Drink water between samples, keep the pours small and never drive after a tasting. Your first step: find a single grain on a bar menu or shop shelf and taste it next to the house blend. You will start to hear the grain in every blend after that.
Common questions
What is grain whisky made from?
Water, a small share of malted barley for its enzymes and other cereals such as wheat or maize, usually distilled in a column still.
Is grain whisky the same as blended whisky?
No. Grain whisky is one ingredient. Blended whisky mixes grain whisky with malt whisky.
What is a Coffey still?
A column still patented by Aeneas Coffey in 1830. It distils continuously and makes the lighter spirit used for grain whisky.
