What is a Sub-GI and Why Does it Matter? - by Kathy Malone

An appellation or geographic indicator (GI) is a means of delineating “terroir” geographically.  Terroir refers to the set of conditions that contribute to the character of the fruit, and therefore the wine, such that it stands apart from its neighbors.  These conditions range from very broad—latitude/longitude, west-facing vs south-facing, frost-free days etc, to very specific-soil type, prevailing wind direction, even cultural considerations.  READ MORE HERE.