The crushed grapes are put into small 450 kg vats, then transported to the fermentation vat that corresponds to their weight and the plot they came from. Every vat is filled three-quarters full by gravity flow, without pumping. The juice is left on the skins and alcoholic fermentation is ready to begin.
This starts on the second day due to the action of yeast. After about 12 hours of fermentation, the CO2 that is released pushes the skins to the top of the vat, where they form a cap. Three times a day, part of the translucent juice is pumped from the bottom of the vat up to the top to percolate through the cap. This pumping over is done delicately in order to obtain the highest-quality tannin. The operation takes place manually, and a technician makes sure to spray wine all over the cap. This pumping over is done less frequently as time goes on and comes to a halt when the desired relative density is attained.
The juice is left in contact with the cap in temperature-controlled vats for several day. This post-fermentation phase helps to make the free run juice richer and more elegant, and the tannic texture more silky. The free run juice is put into another vat, and the marc is pressed. The various lots of press wine (approximately 10% of the total) are put into barrel to speed up clarification. The best lots will later become part of the ch̢teau's second wine.
In order to preserve each plot�۪s taste profile, malolactic fermentation takes place in vat at a temperature of 20�C. This operation softens the acidity and stabilises the wine. It lasts for anywhere from three weeks to several months. Sulphur is added at the end of this second fermentation to avoid oxidation and any harmful bacteria. Only the smallest possible amount of chemical input products is used at the ch̢teau during winemaking, which must remain as simple and natural as possible.
wine spends a further sixteen to eighteen months in long rows of barrels in a vast underground cellar with subdued lighting at a constant temperature of 14�C. Every vintage is aged in oak: between 300 and 450 barrels