Rivalries are everywhere. Red Sox vs. Yankees. Batman vs. Superman. Thin crust vs. deep dish. Wine is no different.
One of the great cellar debates — one that can quietly divide winemakers faster than cork vs. screwcap — is whole cluster fermentation versus destemming. It’s a philosophical line in the sand, and very few people stand casually in the middle.
Winemakers, as it turns out, are a superstitious and opinionated bunch. Some swear by the magic of fermenting grapes with their stems intact. Others wouldn’t dream of letting a single stem anywhere near their fermenters, insisting on pristine, hand-sorted, fully destemmed fruit. With harvest in full swing here in Napa, it felt like the right time to unpack what all the fuss is about.
Why Use Whole Clusters?
Whole cluster fermentation means fermenting grapes with their stems. Sometimes the grapes stay attached. Other times they’re destemmed and the stems are added back in. Either way, those green, woody bits have a serious impact on a wine’s flavor, texture, and ability to age.
The most obvious influence is on flavor. Wines fermented with stems often show more savory, vegetal notes — think bell pepper, green peas, forest floor, or fresh herbs. These flavors come from compounds called pyrazines, which naturally exist in grapes.
At this point, you might reasonably ask: Why would anyone want their wine to taste like pea soup?
Fair question. Too much of that green character can be a turnoff, and some critics are famously allergic to it. Subtlety is everything. That’s why it’s rare to see wines made with 100% whole clusters. Even winemakers who love stems know how thin the line is between complexity and canned asparagus.
Most opt for moderation, often blending 20–40% whole cluster fruit with destemmed grapes to add lift, spice, and structure without overwhelming the wine.
Which Grapes Work Best?
Not all varietals play nicely with stems.
Bordeaux grapes such as Cabernet Sauvignon, Merlot, Sauvignon Blanc, Malbec already have relatively high pyrazine levels, so adding stems can push them straight into green territory. That’s why traditional Bordeaux producers tend to avoid whole clusters altogether.
Pinot Noir and Syrah, on the other hand, are natural fits. Pinot can lack tannic backbone, and stems help add structure and aromatic intrigue. Syrah’s naturally savory, meaty profile meshes beautifully with the spice and earth that stems bring. Fully destemmed, these wines can feel a bit one-note. With stems in the mix, they can leap from good to unforgettable.
This is why you’ll see whole cluster fermentation most commonly in Burgundy, the Rhône, Oregon, and parts of California.
Who’s Using Whole Clusters?
Some very serious names are firmly Team Stem.
Domaine Dujac’s Jeremy Seysses regularly uses anywhere from 65–100% whole clusters, depending on the cuvée, citing added spice, silkier tannins, and greater complexity.
“We have the feeling that we get greater complexity and silkier tannins with whole cluster fermentation.”
Château Rayas credits whole clusters for the haunting aromatics and age-worthiness of its legendary Châteauneuf-du-Pape. Flowers’ very first Camp Meeting Ridge Pinot was made with 100% whole clusters and aged so gracefully they’ve been believers ever since.
In California, producers like Littorai, Failla, Tantara, Laetitia, and Au Bon Climat regularly lean into whole cluster fermentation for Pinot Noir. Oregon and Washington producers do the same. Even Bordeaux — once firmly anti-stem — has softened, with estates like Smith Haut Lafitte now experimenting with small percentages in their blends.
It’s Not Just About Flavor
Former Château Margaux winemaker Philippe Bascaules once put it bluntly:
“Technical perfection (total absence of stems) can in fact lower the quality.”
Whole cluster wines can feel awkward, or even slightly offensive, in their youth. But give them time, and they often gain depth, perfume, and nuance that fully destemmed wines never quite reach.
Winemakers are still learning how to wield stems wisely. Many believe the decision starts in the vineyard. They’ll chew on stems, crush them, inspect the sap, and judge ripeness before deciding how much (if any!) to include.
What does seem broadly agreed upon:
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Some berries ferment intact, boosting aromatics and complexity
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Intracellular fermentation limits harsh seed tannins, softening texture
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Stem tannins help preserve freshness and structure
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Better temperature regulation allows gentler extraction
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Stems can brighten color and protect wine during barrel aging
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Trapped CO₂ reduces oxidation, often requiring less sulfur later
The Bottom Line
For centuries, fermenting with stems was the norm. Sorting machines didn’t exist, and everything went into the vat. As technology advanced, destemming became the standard. Then winemakers started to realize something had been lost.
Today, we’re seeing a thoughtful return to balance. Not nostalgia. Not dogma. Just a renewed appreciation for what stems can bring when used carefully.
Like most great wine debates, there’s no single right answer, only better questions, better farming, and better judgment in the cellar.
