While visiting wineries in Germany, one winemaker said how crazy the thing is with barriques.
See “French oak barrique” doesn’t mean that is made from French oak. It is an oak barrique from France. Only if you buy a Tronçais/Alliers/Nevers/Limousin etc. barrique, the oak must be from that said forest. Otherwise the oak can come from any forest - even from ones that are not necessarily even in France.
So, many German producers buy oak barriques from France, but being the Germans they are, most never go for the most expensive (ie. Alliers/Nevers etc) casks, but instead buy whatever they have. Often winemakers buy a few different models first, make test runs with the most recent vintage and buy a larger amount based on how the test wines perform.
And do you know which barrels tend to perform the best? Those that are made with oak sourced from Germany! You see, the oak there is exactly the same species than in France (mainly Quercus robur, also some Quercus petraea) and these locations are cooler than those located in the heart of France, so the trees grow at a slower pace, making the wood tighter in grain and thus less aromatic. These barrels have a similar aromatic impact on the wine as those made from French oak, but less intense. The wood tannins are also less easy to extract from these barrels compared to more open-grained French oak barrels. To my understanding the same phenomenon is with the oak barrels made from the forests of Burgundy, Champagne and Vosges - the wood is more dense and tight-grained there and the barrel influence can be more understated compared to the more noticeable influence that the barrels from more southerly forests can impart. This is also the same reason why many old-school producers prefer Hungarian and Slavonian oak - the wood from these places is less overpowering compared to the French oak, which tends to come from the large forests located in the middle of France.
Anyways, this said winemaker laughed that many wine producers thus buy “French oak barrels” made entirely from German oak, so they are willing to pay precious prices on wood that is shipped across the border to France, made into a barrel and shipped back, just to have a famous name on the barrelhead. He said there are a handful of excellent coopers in Germany who make great barrels from same local wood at noticeably lower prices and prefers to use them, since he never saw any difference between the German barrels and French barrels.
So, yes, also oak barrels do have their own terroir. The degree of toasting and the size of the barrel are going to have a more noticeable impact on the wine than where the barrel’s wood is sourced from, but it doesn’t change the fact that there are noticeable differences.