What is the most common type of oak used for aging sherry?

The most common type of oak used for aging sherry is American oak. This variety is favored primarily for its ability to impart distinct flavors to the wine, such as vanilla, caramel, and spice, which complement the nutty and complex characteristics inherent to sherry. American oak is also known for its tighter grain, which allows for a different interaction between the wine and the wood compared to other oak types.

While European oak is also used, particularly in the aging of certain premium sherries, it is not the predominant choice. European oak tends to impart more subtle flavors and has a looser grain, resulting in a slower oxidation process, which may not align with the desired profiles for most sherries. French oak, while esteemed in the wine world for its elegant characteristics, is less commonly associated with sherry aging. Japanese oak is not traditionally used in the production of sherry and is more relevant in the context of other spirits, such as Japanese whisky.