Discovery / Wine Methodology / Whole-Cluster Fermentation
Wine Methodology · Follow your curiosity
Whole-Cluster Fermentation
Berries, stems and a choice at the cellar door: discover what whole bunches bring to fermentation, and how to read the related terms.
A little acquaintance, at a glance.
- Also called
- Whole-bunch fermentation
- Included
- Berries and stems
- Common connections
- Pinot Noir · Syrah
- Read closely
- Bunch · berry · press
What goes into the fermenter?
Whole-cluster, also called whole-bunch, fermentation includes grape bunches with their stems in the fermentation vessel. A maker can include a proportion of whole bunches alongside destemmed fruit, or use them for the whole lot. The percentage describes the fruit handled that way, rather than a second grape in the blend.
Pinot Noir and Syrah offer familiar routes into the technique. Ask about the specific cuvée and vintage: a producer may adjust the proportion as fruit and stem condition change.
Three phrases worth separating
| Phrase | What it describes |
|---|---|
| Whole cluster / whole bunch | Berries and stems go into fermentation together. |
| Whole berry | Berries remain relatively intact; they may already have been removed from their stems. |
| Whole-cluster pressing | Bunches go into a press to release juice. Fermenting that juice is a separate stage. |
Why keep the stems?
Stems can contribute tannins and change the physical structure of the fermenting mass. Intact berries introduce another environment: some may undergo intracellular fermentation while others break and supply juice for yeast fermentation. The result depends on how much intact fruit remains and how it is handled.
Winemakers investigate fragrance, texture and structure, while also watching for overly herbal characters or harsh astringency. Fruit condition, variety, stem condition and the proportion included all matter. A stem’s brown appearance alone is not a complete prediction of the finished wine.
Where carbonic maceration fits
Carbonic maceration places intact berries in a carbon-dioxide-rich environment, allowing metabolism within the berry before the released juice completes yeast fermentation. Some intracellular activity can also occur within a whole-bunch ferment. That possible overlap does not make every whole-cluster wine a deliberately carbonic wine.
Winemakers Research Exchange describes intact berries above the liquid, intact berries immersed in it and crushed fruit supplying fermenting juice. Those different conditions can coexist in a vessel, helping explain why one broad term covers a range of outcomes.
A useful counterexample from Tablas Creek
Tablas Creek’s general winemaking account describes whole-cluster pressing for its white grapes, followed by juice fermentation in different vessels. Its red-grape account describes sorting and destemming before fermentation, with juice and whole berries. Read the verbs carefully: pressing bunches and fermenting whole berries do not by themselves establish stem inclusion during fermentation.
Follow Pinot Noir Wines or Syrah / Shiraz Wines for the finished-wine conversation. The grape is a starting point; the actual producer note supplies the method.
A small Cork Dork discovery
Give your curiosity a little room.
Find two producer notes for wines made from the same grape. Identify the whole-bunch percentage where disclosed, and distinguish it from whole-berry handling or whole-cluster pressing. Compare the stated intention with your own observations of aroma and tannin.
Your observations, your words. Small pours welcome.
A few questions worth uncorking.
Does whole berry mean stems were included?
No. A destemmer can leave many berries intact.
Is whole-cluster pressing the same process?
No. Pressing extracts juice; fermentation with the bunches is a different stage and choice.
Does whole cluster mean carbonic maceration?
No. Intracellular activity can occur, but the conditions and handling need to be established.
Where shall we wander next?
Wine Fermentation →Cap Management →Skin Contact →Pinot Noir Wines →Syrah / Shiraz Wines →Tablas Creek →Behind this introduction
Editorial sources checked 25 October 2026. Composition, production rules and cellar practices can vary by appellation, producer and vintage. The producer’s notes are the place to check a particular bottle.