After the preparation of the cuvee, the wine is transferred into Allier and Nievre forest oak barrels. The wood ennobles to wine, endowing it with aromas, the tannin, thanks to the slow diffusion of air through its pores, melts the elements of the wine which would otherwise be lacking due to its young age.

The Grand Vin of Château Pichon Longueville Comtesse de Lalande is matured for 18 months in the barrels, of which 50% are new oak and 50% one year old oak. The barrels are lightly heated during their production which contributes to the quality of their fragrance. The use of new wood must not be excessive, the exchange between new wood and the wine must be harmonious and balanced. It is for this reason that the "Réserve de la Comtesse" is made with only 25% new wood.

The racking takes place every three months until the wine is bottled. The fining is always done with whipped egg whites, in strict accordance with tradition, this process allows for the clarification of the wine. The bottling is carried out at the Chateau at the beginning of June of the second year following the grape harvest. The prestigious bottles are stamped with the badges of the Pichon Longueville and Lalande families.