Quick answer:
At its core, natural wine means one thing: native yeast, with nothing added and nothing taken away. Purists insist that also means spontaneous fermentation — the wild yeast already on the grape skins and in the winery doing the work on its own, with no commercial yeast strain introduced. Pragmatists allow a bit more room, including cold fermentation, as long as the underlying ethos holds: nothing added, nothing removed. Either way, native yeast is the non-negotiable starting point.
Native Yeast and Spontaneous Fermentation, Explained
Every grape arrives at the winery carrying wild yeast on its skin, and more yeast lives in the air of the winery itself. In conventional winemaking, a selected, cultivated yeast strain is typically added to control fermentation predictably. In natural winemaking, the winemaker steps back and lets the wild, native yeast already on the grapes do the work — no commercial strain introduced, nothing added, nothing taken away.
For purists, that means spontaneous fermentation specifically: no manipulation of temperature or timing, just native yeast working at its own pace. Pragmatists take a slightly more flexible view — cold fermentation is acceptable to them too, since it doesn't add anything to the wine or strip anything out, it simply slows the process down. Both camps agree on the essential point: it has to be native yeast, not a lab strain.
Why would a producer choose cold fermentation with native yeast at all, rather than letting it run at ambient temperature? Usually for control and precision, not convenience. Fermenting cold slows the wild yeast down, which can preserve more delicate aromatics, avoid volatility, and reduce the risk of the fermentation stalling or turning in an unwanted direction — all without introducing a cultivated yeast strain or removing anything from the wine. It's still native yeast doing the work start to finish. The only thing that's changed is the pace, not the process.
On the farming side, organic practice is generally considered the baseline expectation for a serious natural wine producer. Biodynamic farming goes further still — a more demanding, holistic approach to working the vineyard that many of the best natural wine producers follow, even without seeking formal certification.
Here's where a lot of consumers get it backwards: the common assumption is that "natural wine" simply means no chemicals in the vineyard, no chemicals in the winery, and no additives. That's part of the picture for most serious natural producers, but it's not the definition — and a clean vineyard and cellar alone don't actually qualify a wine as natural. A winemaker could farm organically, use zero additives, and keep the cellar free of chemical intervention, and still ferment with a selected commercial yeast strain rather than the wild yeast already present on the grapes. That single choice — a cultivated strain instead of native yeast — breaks the core principle the whole category is built on, no matter how clean everything else is. Native yeast isn't one item on a checklist; it's the thing the checklist exists to protect.
The Real Test: Can It Stand Blind?
Here's what separates a natural wine worth seeking out from one that's coasting on the label: whether it can hold its own in a blind tasting against a beautifully made conventional wine.
A lot of natural wine leans on funky, unconventional aromas as a kind of proof of authenticity — and for drinkers newer to the category, that's often part of the appeal. But the best natural wine producers aren't making a statement wine. They're making a wine that happens to be natural, and it shows in the glass: clean, expressive, true to its vineyard. Pour it blind next to a serious conventional bottle, and you wouldn't necessarily know which is which. When that happens, it's rarely luck — it traces straight back to the quality of the site: sun exposure, vine age, soil composition. The fermentation choice matters, but it doesn't substitute for a great vineyard.
That standard — passing blind, not just passing as "natural" — is exactly why we chose the producers we carry.
Producers Who Never Needed the Label
Francesco Fiori, in Sardinia, has always fermented with native yeast and let fermentation happen spontaneously. Not as a positioning choice — it's simply the only way the family has ever made wine. Cascina del Monastero follows the same practice. Terre Antiche, farming biodynamically in Lazio, ferments with native yeast across the board — for their Rubino, that means fully spontaneous fermentation in concrete; for their Passerina, "La Forma," it means cold fermentation with native yeast, a choice made for precision, not convenience. Either way, nothing's added and nothing's taken away — just a different pace for the same wild yeast to do its work. None of the three ever built a natural wine narrative around themselves, in fashion or out of it. They didn't need to.
A Few Things Worth Knowing
- Farming isn't guaranteed — no organic requirement attached.
- Sulfites aren't excluded — natural and sulfite-free aren't the same thing.
- Additives and filtration are still possible.
- No certifying body exists, unlike organic or biodynamic.
- It's almost always small-batch, since spontaneous fermentation is hard to control at scale.
FAQ
What makes a wine "natural"? Native yeast, with nothing added and nothing taken away. Purists require spontaneous fermentation specifically; pragmatists also accept cold fermentation, since it doesn't add or remove anything either.
Is natural wine organic? Not necessarily.
Does it contain sulfites? It can.
Is there certification? No official body verifies the claim.
How do you know if it's good? The blind test — it should hold up against a serious conventional wine on quality alone.
Shop natural wine producers: Francesco Fiori · Cascina del Monastero · Terre Antiche
Want to explore more? Browse our entire Natural Wine collection →
