Pétillant Naturel / Pét-Nat (Ancestral Method, Bottled Mid-Ferment)

Pétillant naturel (pét-nat) is the now widely accepted shorthand for sparkling wine made by the méthode ancestrale, the oldest way of making sparkling wine. The wine is bottled while still undergoing its first fermentation, trapping carbon dioxide naturally. This is fundamentally different from the traditional method (méthode traditionnelle) used for Champagne, which undergoes two fermentations, the second of which takes place in the bottle to create the fizz. There is no official definition or legal status for pétillant naturel wines: it is an informal label, and pét-nat can be made from any grape variety, in any region of any country. In Limoux, Benedictine monks are credited with the production of a naturally sparkling wine in 1531, a tradition that pre-dates that of Champagne. In Gaillac, nobody knows precisely when the first sparkling wines were made, but the Occitan poet Auger Gaillard (1530-1593) described Gaillac wine that sparkled and jumped in the glass. The modern category is linked to Loire producer Christian Chaussard, who inadvertently produced a pétillant naturel wine in the early 1990s, after which other Loire producers took up the style. It was the natural winemakers of the Loire Valley who brought pét nat onto the wine world stage in the 1990s, with Agnès and René Mosse a good example.

• Ancestral method means bottling during the first fermentation, which then finishes in the bottle
• The Gaillac and Bugey-Cerdon rules forbid adding a liqueur de tirage or a liqueur d'expédition
• Pét-nat can be made from any grape variety, in any region of any country
• Several French appellations regulate the method as méthode ancestrale, among them Limoux, Gaillac and Bugey-Cerdon

The winemaker bottles a partially fermented wine while enough sugar remains to generate the carbonation: for Bugey-Cerdon méthode ancestrale, INAO's cahier des charges requires a partially fermented must with at least 40 grams per litre of fermentable sugars (glucose and fructose) at bottling. In Gaillac, the grapes are hand-picked and taken whole to the press, and repeated filtrations and natural cold slow the fermentation so that by March there is a clear, partially fermented wine, which is then bottled. Both the Gaillac and Bugey-Cerdon rules state that the fermentation is controlled by cold and by removing part of the yeast population. As temperatures warm in spring, fermentation resumes spontaneously in bottle and creates a natural mousse without any liqueur de tirage; it ends when the yeast cells deplete the supply of residual sugar. Most pét-nats are bottled using a simple crown cap, like a bottle of beer or a soft drink, although some use a cork and cage. The spent yeast can stay in the bottle: pét nat may be disgorged, like a bottle of Champagne, to separate the wine from the dead yeast cells, or left with its sediment. The rules differ by appellation. In Gaillac and Bugey-Cerdon the deposit may be removed by disgorgement or by isobaric filtration, while the Montlouis-sur-Loire cahier des charges requires its single-fermentation sparkling wines to be disgorged, with tirage no earlier than 1 October of the harvest year and disgorgement after at least 9 months.

• Fermentation is slowed by cold before bottling; the Gaillac and Bugey-Cerdon rules add the removal of part of the yeast population, while Montlouis-sur-Loire allows control by cold only
• Crown caps are the usual closure; sparkling wine bottles use thicker, heavier glass to withstand the pressure
• In Gaillac and Bugey-Cerdon, méthode ancestrale bottles must rest at least 2 months on their lees
• Disgorgement is optional: some AOCs require it, opinions are split over whether or not to disgorge a pét-nat, and many are left with their lees for a cloudy, textured result

Ancestral-method wines are typically lightly sparkling, softly textured and fruit-driven, and because fermentation finishes in bottle, pét-nats usually contain lees, giving them a cloudy appearance. The bubbles are more gentle than in traditional-method sparkling wines and alcohol levels are generally modest, and some pét-nats keep a little residual sweetness because fermentation does not always fully finish in the bottle. Style depends on the appellation. Gaillac méthode ancestrale shows fine bubbles, an abundant mousse and aromas that can recall apple, characteristic of Mauzac, while Limoux méthode ancestrale develops fruity aromas of ripe apple. Blanquette Méthode Ancestrale is a naturally fermented, sweet version with about 7% alcohol and 80 to 90 grams per litre of residual sugar, and more of a baked apple aroma and flavour. The Cerdon name within AOC Bugey is reserved for pink sparkling wines of aromatic type, and its méthode ancestrale wines must contain between 22 and 80 grams per litre of fermentable sugars. Montlouis-sur-Loire's single-fermentation sparkling wines, by contrast, must contain no more than 5 grams per litre, and show an elegant, creamy bubble, with white flowers and white-fleshed fruit.

• Lightly sparkling, softly textured and fruit-driven
• Lees usually remain in the bottle, giving a cloudy appearance
• Alcohol is generally modest; Blanquette Méthode Ancestrale has about 7% alcohol
• Sweetness varies by appellation: 22 to 80 g/L fermentable sugars for Bugey-Cerdon méthode ancestrale, no more than 5 g/L for Montlouis-sur-Loire's single-fermentation wines

Pét-nat's growth goes hand in hand with the resurgence of the natural wine movement, and the two share the same philosophy: organic or biodynamic farming, minimal to zero use of sulphur, fermenting with natural yeasts and avoiding fining and filtration. Ancestral-method wines are likewise closely associated with minimal-intervention and natural winemaking. Aromatic white varieties such as Riesling and Muscat perform well, as do grapes that bring good acidity, and juicy red grapes like Gamay can also work. In France, the appellations where this style of winemaking is the norm include Limoux's Blanquette Méthode Ancestrale, Gaillac's Méthode Gaillacoise, Bugey-Cerdon and the Rhône's Clairette de Die Tradition. In Montlouis-sur-Loire, growers relaunched single-fermentation sparkling wines, the first method used to obtain sparkling wines, from the 2000s. Beyond France, the style is gaining traction in North America, with exponents in California (Cruse Wine Company), Maine (Oyster River), Vermont (La Garagista) and New York State (Channing Daughters). In Australia, Tim Wildman MW made his first pét-nat in the Adelaide Hills in 2014, and by his account it was one of about five or six Australian versions. The price point for a pét-nat is often more approachable than Champagne.

• Closely associated with minimal-intervention and natural winemaking
• Shared natural-wine practices: organic or biodynamic farming, minimal to zero sulphur, natural yeasts, no fining or filtration
• French strongholds include Limoux, Gaillac, Bugey-Cerdon, Clairette de Die and Montlouis-sur-Loire
• Price point often more approachable than Champagne

Limoux: the Blanquette de Limoux sparkling wines are made by a second fermentation in bottle, while the méthode ancestrale wines come from a first fermentation completed in bottle; Limoux's sparkling wines were recognised as an appellation in 1938, with the Mauzac grape. The 2016 harvest declaration recorded 5,334 hectolitres of AOC Limoux méthode ancestrale, against 31,414 hectolitres of Blanquette de Limoux and 45,493 hectolitres of Crémant de Limoux. Gaillac: the first AOC Gaillac decree dates from 1938 and covered sparkling wines made by the méthode ancestrale (known as méthode gaillacoise) or by second fermentation in bottle; méthode ancestrale is made exclusively from Mauzac B and Mauzac Rose Rs, both of which originate in the Gaillac area. Bugey-Cerdon: the Cerdon geographical name within AOC Bugey is reserved for pink sparkling wines of aromatic type from Gamay and Poulsard, and a Cerdon méthode ancestrale cannot be made from Poulsard alone. Montlouis-sur-Loire: the appellation added Pétillant Originel to its regulations. The cahier des charges modification adopted by INAO's national committee on 18 June 2026 requires the single-fermentation sparkling wines to come from Chenin, from hand-picked grapes carried whole to the press, made without enrichment and without added yeast, and disgorged. La Grange Tiphaine's Nouveau Nez is a Montlouis-sur-Loire pét-nat. In North America, exponents include Cruse Wine Company in California, Oyster River in Maine, La Garagista in Vermont and Channing Daughters in New York State.

• Limoux méthode ancestrale: first fermentation completed in bottle
• Gaillac méthode ancestrale (méthode gaillacoise): Mauzac B and Mauzac Rose Rs only, at least 3 bars of overpressure
• Bugey-Cerdon méthode ancestrale: pink, from Gamay and Poulsard, 22 to 80 g/L fermentable sugars, at least 3 bars measured at 20°C
• Montlouis-sur-Loire: single-fermentation sparkling wines from Chenin must be disgorged and contain no more than 5 g/L of sugars

The ancestral method is inexpensive but risky and difficult to control. In the traditional method, producers add a measured amount of sugar and yeast and can accurately predict the final alcohol level and pressure in the bottle. The ancestral method, by contrast, bottles the wine before it completes its first fermentation, and the process continues in the bottle. There are often subtle differences in character between bottles, as some finish fermentation with more residual sugar than others. Not disgorging can also have explosive results: too much sediment or tartrate crystals in the final wine can lead to what is sometimes called gushing, leaving only a third of the liquid in the bottle. Pét-nats are also at risk of the faults that sometimes affect natural wines, such as excessive brettanomyces or volatile acidity, or a mousiness to the flavour. In general, pét-nats are not made for ageing and should be enjoyed young, shortly after bottling.

• Inexpensive but risky and difficult to control
• Bottles can differ, as some finish fermentation with more residual sugar than others
• Too much sediment or tartrate crystals in undisgorged bottles can cause gushing
• Fault risks shared with natural wine: brettanomyces, volatile acidity and mousiness
• Best enjoyed young, shortly after bottling

Primary sources (WSET, INAO, and the Comité Champagne's Champagne.fr): https://www.wsetglobal.com/knowledge-centre/blog/2026/a-guide-to-sparkling-wine-production-methods-and-regional-styles, https://www.wsetglobal.com/knowledge-centre/blog/2023/january/13/what-is-natural-wine, https://www.inao.gouv.fr/produit/limoux-methode-ancestrale-9587, https://extranet.inao.gouv.fr/fichier/PNOCDCBugey.pdf, https://extranet.inao.gouv.fr/fichier/CNAOV-2016-433-Gaillac.pdf, https://extranet.inao.gouv.fr/fichier/6-PNO-CDC-Montlouis-sur-Loire-2026.pdf, https://extranet.inao.gouv.fr/fichier/COMNAT-CST-20210511-1-20170615-NP-CNINAO-exp%C3%A9-MAV-AO-Limoux.pdf, https://www.champagne.fr/en/champagne-frequently-asked-questions. Last verified 2026-10-04