The Petraea champagne from Francis Boulard & Fille is produced using a technique similar to that of the Solera. The principle of this production consists of adding 50% of the last harvest each year. Thus, all the previous vintages make up the champagne with a decreasing balance. It was in 2012 that this perpetual reserve was relaunched, in organic. The Petraea cuvée is composed of 50% 2012 harvests and 50% 2014 harvests, with a dosage of 0 g/l. The siliceous-calcareous soil of the Massif de Saint-Thierry terroir gives this cuvée an exceptional quality. After vinification, the aging takes place in oak tuns (Quercus Petraea). Thanks to this perpetual reserve, a volume of old wines blended and aged in tuns is created. Each year, part of this volume is taken for bottling, while the released volume is completed by the last harvest, vinified and aged independently. Natural indigenous yeasts are used for fermentation, and vinification is done without filtration or fining. It is at a pressure of 5 atmospheres per cm² that the foaming is limited, unlike the 6 atmospheres of classic vintages. This allows to obtain a fine discreet foam, which accentuates the structure and the vinous character of this vintage, while preserving its elegance. Francis Boulard & Fille's Petraea cuvée has received countless distinctions such as: 18/20 Gault & Millau Guide Champagnes 2022, 94 pts Robert Parker (MMVII), 93/100 Bettane & Desseauve 2022, 17/20 Guide Vert RVF 2016 (MMVII), 4 stars Gerhard Eichelmann (MMVI-MMVII), 17/20 Guide Exclusif Champagne 2014 (MMVII), 18/20 Jacques Dupont (MMVII) and 19/20 Guide Revel 2014 (MMVII).
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