G as in ...
      
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Green harvest grapes

These green harvest grapes were grown on the world-famous Bordeaux Chateau Haut-Brion estate. Their wines go for several hundred dollars a bottle, and up. At least in their case, green harvesting works.

Gallon
A gallon is 128 ounces. On a more interesting note, a gallon is 5 bottles of wine, corresponding to about twelve pounds of grapes.
Glycerol
Glycerol is a sweet alcohol produced during fermentation. Because it composes less than 10% of the wine’s alcohol, it has little effect on the wine’s viscosity (gooeyness).
Grafting
The process of growing a shoot or bud of a European Vitis vinifera grape on American or hybrid, resistant rootstock. This process ‘saved’ the classic wine industry when almost all European vines were dying due to an infestation of the Phylloxera louse, which interestingly enough came to Europe from the United States. Some believe that ungrafted vines produce better wines than grafted ones.
Green harvest
The practice of removing unripened grape bunches, augmenting the quality by reducing the yield per vine. Too many grapes on a vine lead to a thin, relatively tasteless wine.
Grey Rot
A vine affliction caused by the same fungus, Botrytis Cinerea, that causes Noble Rot. Grey Rot occurs when the humidity is excessive.
      
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