Comparison
Pét-nat vs traditional method
What is the difference between pét-nat cider and traditional-method cider?
In short
A pét-nat — pétillant naturel, or méthode ancestrale — is bottled while its one and only fermentation is still running. The sugar still in it finishes fermenting under the cap, and the gas stays in. Nothing is added, nothing is restarted, and how much gas results depends on how much sugar the maker judged was left.
The traditional method ferments the cider to dryness first, then adds a measured dose of sugar, and often a cultured yeast, and seals it for a second fermentation. The gas is the product of a known quantity, the cider usually ages on its yeast for months, and the deposit is often removed by riddling and disgorging before it is sold.
So the difference is not the bottle, which both use, but whether the sugar was measured. That is why the traditional method can reach and hold Champagne-like pressures predictably, and why pét-nat is the carbonation route with the highest over-pressure risk of any.
The two things being compared
Each side described in its own terms first, so the table below has something to hang on.
Pét-nat
One fermentation, bottled before it ends; the sugar it had left makes the gas.
Traditional method
A dry base, a measured dose of sugar and yeast, and a second fermentation in the sealed bottle.
Where they differ
Dimension by dimension. Where a row needs a qualification, it carries one rather than being simplified until it fits.
| Dimension | Pét-nat | Traditional method |
|---|---|---|
| Fermentations | One, interrupted by bottling. | Two: the primary run dry, then a second started in the bottle. |
| Where the bottle sugar comes fromA hydrometer cannot tell fermentable sugar from sorbitol and other solids, which is why the pét-nat estimate is an estimate. | Whatever the primary had not yet consumed, estimated from the gravity. | A measured dose — the Traditional Welsh specification permits 12 to 26 g/L of fermentable sugar for it. |
| Pressure | Lower and less predictable; the Welsh specification puts bottle-conditioned cider at 1.5–3.0 bar at 0 °C. | Higher and set by the dose; 4.0–6.0 bar at 0 °C for bottle-fermented cider under the same specification. |
| Sweetness | Often some left, where cold or a starved yeast stopped the ferment before dryness. | Dry unless sugar is added back at disgorging. |
| Sediment | Usually left in the bottle, so the cider is cloudy or throws a deposit. | Often removed by riddling and disgorging; left in where the producer chooses. |
| Time on yeast | Short; the cider is usually sold young. | Commonly months, which is where the bready, savoury lees character comes from. |
| Bottle-to-bottle variation | Real: each bottle finishes its own ferment with its own yeast population. | Small, because each bottle received the same measured dose. |
| Glass | Rated sparkling bottles, kept cold. | Bottles able to withstand 6–12 bar at 25 °C, in the Welsh specification’s terms. |
Notes under a dimension name qualify the whole row, not one column.
When Pét-nat is the relevant one
The circumstances in which this is the thing being described, rather than a reason to prefer it.
- The cider went into the bottle while it was still fermenting, with nothing added.
- You are describing a Norman cidre bouché made from a keeved, slow ferment, or a modern pét-nat.
When Traditional method is the relevant one
The circumstances in which this is the thing being described, rather than a reason to prefer it.
- A dry cider was dosed with sugar and sealed for a second fermentation.
- The label says traditional method, méthode traditionnelle or bottle-fermented and the cider was disgorged.
A misconception worth clearing up
This comparison exists partly because of the claim below, which is repeated often enough that most readers arrive holding it.
Pét-nat is a simpler, gentler version of the Champagne method.
What is actually the case: It is older and simpler, and it is not gentler. Because nobody measured the sugar that makes its gas, it is the carbonation route most likely to over-pressurise a bottle; traditional-method producers reach higher pressures predictably because their dose was weighed.
Related comparisons
Distinctions that turn on the same thing, or that this one is routinely confused with.
Traditional method vs tank method
Both carbonate by a second fermentation, but the traditional method runs it in the bottle the cider is sold in and the tank method runs it in a pressure vessel before filtering and filling under pressure.
Bottle-conditioned vs force-carbonated
Bottle conditioning makes the carbon dioxide inside the sealed bottle by fermenting a small amount of sugar there; force carbonation dissolves gas into the finished cider under pressure before packaging.
Keeved vs fully fermented
Keeving strips nutrients out of the juice before fermentation so that the yeast starves before the sugar is gone, leaving natural sweetness; a fully fermented cider runs to dryness and is sweetened afterwards if at all.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- What is keeving, and how does it differ from an ordinary fermentation — Keeving deliberately strips nitrogen out of the juice before fermentation so the yeast runs out of nutrient and stops with sugar still present. The result is naturally sweet without anything being added, where an ordinary fermentation runs to dryness and any sweetness has to be put back.
- What is the difference between bottle-conditioned and force-carbonated cider — A bottle-conditioned cider gets its gas from a fermentation finishing inside the sealed bottle, and leaves a yeast deposit; a force-carbonated one has carbon dioxide dissolved into it under pressure before filling. The first keeps changing in the bottle and the second does not.
- What is the difference between traditional method and tank method sparkling cider
Where to go next
- All comparisons — The rest of the pairs, grouped by what kind of difference is at stake.
- Glossary — Either term on its own, defined without a second thing to hold it against.
- Learn about cider — The background these pages assume, written from the beginning.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
The New Cider Maker’s Handbook: A Comprehensive Guide for Craft Producers
Claude Jolicoeur, Chelsea Green Publishing, 2013. ISBN 9781603584739 · reference work · bibliographic record verified, not opened 2026-08-25
Bibliographic record verified on 2026-08-25 against the Open Library union catalogue: Chelsea Green Publishing, 2013, ISBN 9781603584739, one edition recorded. That establishes the citation points at a real book in a stated edition, which is what a citation needs and is all it establishes. No copy was opened and nothing is quoted from it. The book itself is in print and not digitised in any open collection; where CiderHQ needs a figure from this territory it uses an accessible research source instead and says so.
Institut Français des Productions Cidricoles (IFPC)
IFPC · research institute · retrieved 2026-08-24
The French technical institute for cider production. The authority for the French cultivar classification families, for keeving as an industrial process, and for the pectin and nitrogen chemistry that keeving depends on.
UK protected geographical food and drink names register
Department for Environment, Food and Rural Affairs · government · passage verified 2026-08-25
The register itself is an index; the substance is in the product specification attached to each entry as a PDF. Eight cider and perry specifications were downloaded and read on 2026-08-24 — the six Three Counties names and the two Welsh ones. Reading them settled a question CiderHQ had previously described in the abstract and got wrong: the Three Counties specifications state a composition table, not a minimum juice content. The Traditional Welsh Perry specification was re-read on 2026-08-25 for the comparison with Austrian fruit-wine law, and its prohibition list transcribed in full: the two instruments turn out to regulate opposite things, one composition and one technique.
Cider and perry production technical training material
Peter Mitchell / Cider and Perry Academy · reference work · registered as competent for this subject
Searched again on 2026-08-25 and it remains the one printed source here that a bibliographic check cannot fix, because it is not a published work with an edition. It is course material issued to participants of a training programme, so there is no catalogue record to verify, no ISBN, and no lawful public copy. Its state stays `registered` for that reason rather than through inattention.