One of the biggest influences on the flavour of wine is whether it has been matured, or even just stored, in oak. There are people who are prejudiced against oaked wine and will complain of even the slightest hint of oak, but many experts agree that if a wine has been carefully oaked it does not taste of wood, but more like a wine that has had its flavour subtly enhanced.

Oak aging of wine occurs when the wine has been fermented and/or aged in oak casks so that the flavour of the surrounding wood infuses some of its woodiness into the liquid. The resulting wine will usually taste richer, with creamy vanilla undertones and sometimes a little woody or even sawdusty. The oak is a type of seasoning for wine and getting the optimum level of oaky flavour is vital if a wine is to taste good at the end. Oak aging usually takes place in small oak barrels that hold 225 litres, being replaced every two or three years as newer barrels give the best flavour. Oak is considered to be the most ideal wood for this aging as it not only has superb watertight qualities but gives the right sort of flavours,aromas and textures to enhance the wine. But there are different types of oak that offer certain distinctive flavourings.

The most commonly used are the highly-prized, tightly-grained French oak which gives a subtle hint of oakiness, whilst American oak gives a more obvious vanilla character to the wine. Consequently wines that are more powerful in flavour tend to be stored in American oak such as Rioja, North and South American and Australian varieties. Other factors that allow oak aging to affect a wine