Aroma’s in wine – from grape to glass
Wine is more than a drink. It’s an aromatic journey that tells the story of place, time, and technique. The scent of a wine, often referred to as its “nose”, offers the first insight into what’s in the glass. Understanding how these aromas form helps sharpen your senses and appreciate the craftsmanship behind every bottle.
Primary aromas: the grape’s voice
Primary aromas come directly from the grape and its growing environment. They’re the most immediate scents you’ll notice when swirling a young wine and reflect both variety and terroir.
- Fruit: Think cherry and raspberry in pinot noir or blackcurrant in cabernet sauvignon.
- Floral: Gewürztraminer often shows rose petals; syrah can reveal violet.
- Vegetal and herbal: Notes like green bell pepper in cabernet franc or mint in shiraz are common.
These aromas stem from chemical compounds naturally present in grapes, such as terpenes, methoxypyrazines, and thiols. Climate, soil, vineyard management, and grape ripeness all influence how these compounds express themselves.
Secondary aromas: the impact of fermentation
Secondary aromas develop during the winemaking process, particularly during fermentation and early aging. They’re shaped by human intervention; yeast choice, fermentation temperature, and whether malolactic conversion or oak aging is used.
- Yeast-derived: Wines aged on lees or made with traditional sparkling methods often show bready, doughy, or brioche notes.
- Malolactic fermentation: Converts tart malic acid into softer lactic acid, often creating buttery aromas—especially noticeable in chardonnay.
- Oak aging: Toasted barrels contribute vanilla, clove, nutmeg, smoke, and sometimes coconut, depending on the oak’s origin and treatment.
These aromas give structure and depth to wine, layering complexity over the grape’s natural profile. In white wines, they often round out acidity; in reds, they can soften tannins and enhance mouthfeel.
Tertiary aromas: aging and evolution
Tertiary aromas come with time. As wine ages, chemical reactions slowly transform both primary and secondary aroma compounds, introducing new layers of complexity.
There are two key aging paths:
- Oxidative aging: Occurs in contact with air, often through barrel aging. This method can produce nutty, dried fruit, or caramel-like scents.
- Reductive aging: Happens in sealed bottles where oxygen exposure is minimal. This leads to earthy, leathery, or mushroom-like notes.
Well-aged reds may develop forest floor, tobacco, or dried fig aromas. Mature whites can evolve into notes of honey, roasted nuts, or beeswax. These tertiary developments are prized by collectors and sommeliers for the nuance they bring.
Why this matters to tasters
For professionals, recognizing where an aroma comes from grape, fermentation, or age, is essential to quality assessment and food pairing. For enthusiasts, it enhances enjoyment. Being able to distinguish between a ripe raspberry aroma (primary) and a vanilla note from oak (secondary) or a subtle truffle scent (tertiary) makes wine tasting richer and more rewarding.
Understanding aroma development also helps explain vintage variation, stylistic differences, and why some wines are built to age while others are meant to be enjoyed young.
The chemistry behind the scent
Aroma compounds in wine are volatile molecules: meaning they evaporate easily and are detected through smell rather than taste. Even small amounts can have a significant sensory impact. Esters, aldehydes, terpenes, thiols, and pyrazines all play a role, and their concentrations can vary depending on winemaking choices.
While the science can get technical, the takeaway is simple: every step from vineyard to cellar affects what you smell in the glass. No two wines, even from the same grape variety, will smell exactly the same.
Ready to train your nose?
Deepening your understanding of wine aromas starts with tasting; and the best way to do that is with purpose. Our aromatic tasting package, available now in the PIWS webshop, includes a curated set of expressive wines, each selected for their clear aromatic profiles. Whether you’re preparing for formal tasting exams or simply expanding your sensory vocabulary, it’s the ideal way to bring this knowledge to life.
This month is all about blooming aroma’s in wine. Keep an eye on our social channels to learn everything about it. And if you’re excited to find out yourself: Shop your aromatic tasting box at our webshop!
