From Grape to Wine: What Happens in the Cellar After the Harvest
The second act of the harvest
The harvest is often celebrated as the high point of the winegrowing year. But for those who live wine from the inside, what happens after the picking is as important as, if not more than, the act of gathering the grapes. When the fruit reaches the cellar, the so-called “second act” of the harvest begins — the moment when the potential of the grape starts to be converted into wine. Here, tradition and technology meet in every decision, from the way the grapes are received to the choices of fermentation and ageing.
The cellar is a place of science and of culture, where every movement has a direct impact on the final style of the wine. The journey begins with the sorting of the fruit, moves on to destemming and crushing, passes through fermentation — the fundamental transformation that gives rise to the alcohol — and culminates in the ageing, where the wine grows, gains body, complexity and balance.
This article sets out to open the doors of the cellar and show, step by step, what happens after the harvest. More than a technical manual, it is a sensory journey that reveals how every detail shapes the character of the wine that will reach your table.
Selecting the grapes: the first quality decision
Once picked, the grapes do not go straight to fermentation. The first step is selection, which can be done by hand, on sorting tables, or with cutting-edge technology such as optical systems that analyse the colour and texture of the berries. This stage is decisive because it ensures that only healthy fruit at the right point of ripeness goes into the winemaking. Green or shrivelled grapes, those attacked by fungi or damaged in transport, are removed, avoiding faults in the wine.
In larger-scale projects, selection may be less rigorous, with batches from different plots vinified together. In premium wines, by contrast, the sorting is done with extreme care, often bunch by bunch. There are also producers who choose to separate the harvest according to specific vineyards, terroirs or grapes, creating wines of more marked identity.
Selection is not only a technical matter, but also a philosophical one. It represents the first moment at which the winemaker decides the direction the wine will take.
A more permissive choice can result in greater volume and accessible prices. A rigorous selection, though more costly, opens the way to wines of higher quality, with greater expression of terroir and greater longevity.
Destemming and crushing: releasing the must
Once selection is done, the moment of destemming and crushing arrives. Destemming consists of separating the berries from the stalk, the woody part of the bunch. That decision depends on the style of wine one wishes to produce. Removing the stalk results in softer wines, with more polished tannins. Keeping it, on the other hand, can bring freshness, structure and vegetal notes that in some styles are much appreciated, as in certain reds for ageing.
The purpose of crushing is to release the must — that is, the mixture of juice, skins and pips that will serve as the base for fermentation. Nowadays it is done gently, only breaking the skin of the berry so as not to extract bitter flavours from the pips. In whites and rosés, direct pressing is often chosen: the grapes go to the press right after harvest, and the must is separated from the skins, avoiding the extraction of colour and tannins.
This apparently simple step defines the style of the wine. A partial destemming, for example, can balance freshness and softness. And the type of press used — pneumatic, traditional or continuous — influences the intensity and texture of the must. It is at this stage that it is decided how the fruit turns into raw material for the wine.
Fermentation: the transformation into wine
Fermentation is the heart of the winemaking process. It is here that the yeasts — whether natural, present on the grape and in the cellar, or selected in the laboratory — turn the sugars of the must into alcohol and carbon dioxide. This simple chemical process has a profound impact, because at the same time as it creates the alcohol, it releases an infinity of aromatic and textural compounds that define the identity of the wine.
In reds, fermentation is accompanied by maceration — that is, prolonged contact with the skins and pips. It is from there that the colour, the tannins and part of the aromatic complexity are extracted. In whites and rosés, fermentation usually takes place without prolonged contact, preserving freshness and primary aromas.
Another common process is malolactic fermentation, which turns malic acid (more aggressive) into lactic acid (softer), lending roundness and buttery notes. The choice of whether or not to carry out this secondary fermentation depends on the desired style: essential in structured reds, optional in fresh or vibrant whites.
Controlling the temperature is fundamental: fermentations that are too hot can burn off aromas, while those too cold can stop before their time. Here the winemaker acts as a conductor, balancing tradition and science to ensure the wine is born healthy and expressive.
Ageing: time and patience in the cellar
After fermentation, the wine enters its ageing, a phase where time and patience play central roles. This stage allows the wine to stabilise, gain complexity and develop new layers of aroma. Ageing can take place in vessels of different materials, each with a distinct impact.
Stainless steel is neutral, preserving freshness and fruit, ideal for young white wines or reds of a lighter profile. Oak barrels, on the other hand, add notes of vanilla, coconut, spice and toast, as well as allowing a micro-oxygenation that softens the tannins. The type of wood, its origin (French, American, Portuguese) and the length of its use directly influence the profile of the wine.
Other alternatives, such as clay talhas or amphorae, are being rediscovered in Portugal, bringing more mineral styles tied to ancestral tradition. Ageing can also take place in bottle, essential for wines for keeping that evolve slowly in a controlled environment.
Deciding the length of ageing is a strategic choice: wines for quick drinking may spend only a few months in stainless steel; wines of excellence may spend years in barrel and in bottle before reaching the market. Ageing is, in short, the phase in which the wine gains its final identity.
Conclusion: from the cellar to the table
The journey from grape to wine is made of careful decisions, where technique and philosophy meet. From rigorous selection to the choice of destemming, through fermentation and ageing, every stage contributes to the authenticity and quality of the final wine. It is this set of choices that explains why two wines, made from the same grape and in the same region, can be so different from one another.
More than a technical process, winemaking is a way of interpreting nature. The winemaker acts as a translator of the terroir, respecting what the vine gave in that year, but shaping it to create balance, pleasure and longevity. It is this alchemy between science and art that makes wine one of the most fascinating drinks of humankind.
In the end, every bottle is a testament to work that begins in the field but is only completed in the cellar. The next time you open a wine, remember: inside it lie months of invisible decisions that made all the difference to what you are tasting.
From the page to the glass
- 1808 Colheita Tinto — Tinta Roriz from Beira Interior, organic and vegan.
- 1808 Colheita Branco — Síria and Fonte Cal at 690 metres, six months in French oak.
