Oak (wine) - Oak Types and Sources

Oak Types and Sources

The species of oak typically used for American oak production is the Quercus alba which is a white oak species that is characterized by its relatively fast growth, wider grains and lower wood tannins. It is found in most of the Eastern United States as well as Missouri, Minnesota and Wisconsin where many wine barrels are from. In Oregon the Quercus garryana white oak has started to gain usage due to its closer similarities to European oak.

In France, both the Quercus robur (common oak) and Quercus petraea (white oak) are considered apt for wine making, however, the latter is considered far superior for its finer grain and richer contribution of aromatic components like vanillin and its derivates, methyl-octalactone and tannins, as well as phenols and volatile aldehydes. French oak typically comes from one or more primary forests: Allier, Limousin, Nevers, Tronçais and Vosges. The wood from each of these forests has slightly different characteristics. Many winemakers utilize barrels made from different cooperages, regions and degrees of toasting in blending their wines to enhance the complexity of the resulting wine.

Italian winemakers have had a long history of using Slavonian oak from the Quercus robur which is known for its tight grain, low aromatics and medium level tannins. Slavonian oak tends to be used in larger barrel sizes (with less surface area relative to volume) with the same barrels reused for many more years before replacement. Prior to the Russian Revolution, Quercus petraea oak from the Baltic states was the most highly sought after wood for French winemaking. Today Russian oak from the Adygey region along the Black Sea is being explored by French winemakers as a cheaper alternative to French oak. Canadian wineries have been experimenting with the use of Canadian oak, which proponents describe as a middle ground between American and French oak even though it is the same species as American oak.

Oak trees are typically between 80–120 years old prior to harvesting with the ideal conditions being a cool climate in a dense forest region that gives the trees opportunity to mature slowly and develop a tighter grain. Typically one tree can provide enough wood for two 225-litre (59 US gal) barrels. The trees are typically harvested in the winter months when there is less sap in the trunk.