All about Oak Barrels

French Oak. All time Classic

French oak adds structure and complexity in a gradual, balanced way. The wood’s origin—including forests such as Tronçais, Bercé, Allier and Vosges—influences the barrel’s characteristics, but its final style also depends on the oak species, grain tightness, seasoning period and toasting profile.

The choice between tighter and more open grain significantly affects the wine’s ageing process. Tight-grained oak (fine or extra-fine grain) is more porous than open-grained oak. A tight-grained barrel will be more aromatic, while a barrel with a more open grain will release more tannins (ellagitannins) into the wine over a shorter ageing period.

Before the barrel is made, the oak staves are naturally seasoned outdoors for two to four years, sometimes longer. During this period, exposure to rain, wind and sunlight helps reduce bitterness and harsh tannins while developing the wood’s aromatic potential.

The right combination of wood origin, grain tightness, seasoning period and toasting allows the barrel to be tailored to the wine’s style, supporting fruit expression and the winemaker’s vision.

American Oak. Massive improvements in quality.

Barrels made from American oak (Quercus alba) have undergone an unprecedented transformation in quality in recent years.

Careful attention to extended seasoning, raw material quality and toasting levels, together with extensive research and development, allows producers worldwide to benefit from a more affordable alternative to French oak.

Structural differences between American and French oak allow American oak to be processed more efficiently, generating less waste and therefore generally resulting in a lower cost than French oak.

Its sensory profile, characterised by greater sweetness and higher levels of whisky lactones, provides winemakers with additional tools to refine and shape the style of their wines.

Eastern European Oak. A quality alternative

Tonnellerie Doreau barrels are made from European oak sourced from three main forest regions in Romania: Transylvania, Moldavia and Wallachia. Each has a slightly different character, offering versatility and diversity.

Transylvania is home mainly to Quercus petraea (sessile oak), the same tight-grained species used for French oak barrels. It delivers elegant aromas of vanilla, coffee and liquorice, making it particularly suitable for red wines where complexity is desired without excessive oak influence.

In Moldavia, Quercus robur (pedunculate oak) is more common. It is less aromatic but contributes more tannins (ellagitannins). This oak provides greater structure, making it well suited to full-bodied red wines or wines intended for extended ageing.

Wallachia lies between the two regions, and its oak likewise falls somewhere in between, combining both species. The result is oak with a medium to tight grain, offering more tannins than Transylvanian oak while retaining pronounced aromatic expression.

By combining these three sources, Doreau can create a wide range of versatile barrel profiles tailored to the desired winemaking outcome.