What is a defining characteristic of Irish Grain Whiskey?

A defining characteristic of Irish Grain Whiskey is that it is distilled in a column still, which is also known as a continuous still or patent still. This method allows for a more efficient distillation process compared to pot still distillation, enabling the production of high volumes of whiskey with a lighter, less robust flavor profile. The column still distillation produces a spirit that is typically more neutral in flavor, making it suitable for blending with other whiskeys.

In contrast, pot still distillation is used primarily for Irish Pot Still whiskey and results in a richer flavor due to the use of both malted and unmalted barley. While Irish whiskey must indeed be aged for a minimum of 3 years according to regulations, the age of 5 years is not a specific requirement for grain whiskey alone. Additionally, Irish Grain Whiskey can include a variety of grains beyond just malted barley, such as corn or wheat, which further distinguishes it from purely malted expressions.