Highlights
Pet-nat is a lightly sparkling wine usually made using the ancestral method. Its name is short for the French pétillant naturel, meaning “naturally sparkling”.
WineDaddy quick explainer
What alcoholic fermentation changes
Yeast uses fermentable grape sugars and transforms grape juice or must into wine.
Grape sugar
Mainly glucose and fructose provide the starting material.
Yeast activity
Yeast metabolises sugar while conditions such as temperature and nutrients affect progress.
Main outputs
Ethanol, carbon dioxide and heat are produced as sugar falls.
Style effects
Other fermentation compounds can influence aroma, flavour and texture.
RememberSugar → ethanol + carbon dioxide + heat, with other compounds also formed.
The key idea is simple: fermentation begins before bottling, then continues in the sealed bottle. The yeast produces carbon dioxide as it converts grape sugar into alcohol. Because the bottle is sealed, some of that carbon dioxide dissolves into the wine, creating its sparkle.
Pet-nat is a wine style, not a grape variety or region. It has no single flavour profile. Depending on the grapes and winemaking choices, it may be dry or sweet, clear or cloudy, fruity or savoury, gently fizzy or more energetic.
Highlights
- Pet-nat is short for pétillant naturel.
- It is commonly associated with the ancestral method of sparkling-wine production.
- Fermentation continues in the bottle, creating the carbon dioxide that makes the wine sparkling.
- Pet-nat is not automatically organic, biodynamic, vegan, low-sulphur, unfiltered or made with wild yeast.
- Cloudiness and sediment are common possibilities, but they are not guaranteed.
- Australian pet-nat can be made from many different grape varieties.
- Chill the bottle, handle it gently and open it away from people.
- Treat each bottle on its own rather than relying on broad assumptions about the style.
How is pet-nat made?
The usual process starts with grape juice that has begun its first alcoholic fermentation. Before fermentation is complete, the partly fermented wine is bottled and sealed. Fermentation then continues inside the bottle.
This is different from the traditional method, where a finished still wine undergoes a deliberately initiated second fermentation in the bottle. It is also different from the tank method, where the relevant second fermentation takes place in a sealed, pressurised tank before bottling.
Pet-nat production can vary. A winemaker may choose different grapes, yeasts, bottling times, closures, clarification or filtration practices. Some wines retain their yeast sediment, known as lees, while others have some sediment removed or are finished in another way.
For a detailed explanation of the method, see ancestral-method sparkling wine production and what fermentation does in wine.
What does pet-nat taste and look like?
There is no single “pet-nat taste”. The grape variety, ripeness, fermentation and finishing choices all matter.
A pet-nat may show:
- fresh, juicy fruit;
- citrus, orchard or tropical-fruit notes;
- gentle bubbles rather than a highly pressurised mousse;
- a leesy, bready or savoury texture;
- a cloudy appearance;
- visible sediment at the bottom of the bottle.
These are possibilities, not rules. One pet-nat can be bright and clear, while another is cloudy and textural. One may be completely dry, while another retains some sweetness if fermentation stops before all the sugar is consumed.
Lees and sediment are not automatically signs that a wine is faulty. They are also not proof that a wine is better or more “natural”. If you are unsure what to expect, read the label or ask the retailer how the wine should be handled.
Is pet-nat the same as natural wine?
No. The terms overlap, but they describe different ideas.
Pet-nat primarily identifies a sparkling style commonly associated with the ancestral method. Natural wine is a broader and variably defined approach or movement involving choices in the vineyard and winery. Natural wine may be still or sparkling.
The word “natural” in pétillant naturel should not be treated as a certification claim. In Australia, the term Pét-nat is not regulated. It does not, by itself, prove that a wine is:
- certified organic or biodynamic;
- vegan;
- preservative-free or low in sulphur;
- unfiltered or unfined;
- made only with native, or “wild”, yeast;
- made without additions.
Those claims need separate evidence. Australian wine labels are also subject to broader labelling requirements, so look for the information relevant to the particular bottle.
How is pet-nat different from other sparkling wine?
| Style or method | Where the important fermentation happens | What a beginner might notice |
|---|---|---|
| Pet-nat / ancestral method | Fermentation begins before bottling and continues in the bottle | Often gently sparkling; may retain lees or sediment |
| Traditional method | A second fermentation takes place in the bottle in which the wine is sold | Often associated with lees ageing and sediment-removal steps |
| Tank method | A second fermentation takes place in a sealed tank | Often designed to preserve fresh fruit and aromatic character |
| Carbonated wine | Carbon dioxide is added directly | Bubbles do not come from the same fermentation sequence |
Pet-nat is therefore a type of sparkling wine, but sparkling wine is a much broader category. You can learn more in what is sparkling wine?.
What should Australian drinkers look for on the label?
An Australian bottle may use terms such as pet-nat, pétillant naturel, ancestral method or another style description. The presence or absence of one phrase does not tell you everything about how the wine was made.
Australian pet-nat may use local or international grape varieties. No single variety or Australian region defines the style nationally. A Riesling-based pet-nat, for example, should not be treated as representative of every pet-nat.
The safest approach is to assess the individual wine. If certification, sulphur use, filtration, yeast or sweetness matters to you, look for a specific claim or ask for more information rather than assuming it from “pet-nat”.
How should you open and serve pet-nat?
Treat pet-nat like sparkling wine: it can contain pressure, and some bottles may foam more than expected.
- Chill the bottle thoroughly before opening. Around 8–10°C is a useful serving range for sparkling wine.
- Do not shake the bottle.
- Handle it gently, especially if sediment has settled.
- Point it away from people, glassware and anything breakable.
- Keep control of the closure while opening it slowly.
- If it has a crown cap rather than a cork and wire cage, follow the appropriate closure-specific method.
- Pour carefully if you want to leave sediment behind, or follow the label’s guidance if the wine is intended to be served cloudy.
For detailed instructions, read how to open sparkling wine safely and wine serving temperature explained.
Frequently asked questions
Is pet-nat always cloudy?
No. Cloudiness and sediment are common because some pet-nats retain lees, but filtration, settling and sediment removal vary.
Is pet-nat always dry?
No. Sweetness depends on how fermentation progresses and how the wine is finished.
Is pet-nat low in alcohol?
Not necessarily. Alcohol depends on the amount of sugar fermented, the grapes and the production choices.
Is pet-nat made with wild yeast?
Not always. The term does not establish which yeast was used.
Does pet-nat age well?
Do not assume that it is designed for long ageing. Follow the label or producer’s handling guidance for the individual wine.
The most useful way to understand pet-nat is to think of it as a varied sparkling style with a distinctive fermentation pathway—not as a single grape, flavour or certification category.