Secondary aromas develop during winemaking: yeast, butter, vanilla, toast. Discover how fermentation, barrel ageing, and lees contact shape wine character.
Secondary aromas (also called winemaking-derived aromas) are aromas that do not originate from the grape itself but instead develop during fermentation and winemaking. They are the result of cellar processes such as alcoholic fermentation, lees contact, malolactic fermentation, or ageing in barrique.
While primary aromas reflect the character of the grape variety, secondary aromas are the winemaker's signature and the expression of their oenological decisions.
Secondary aromas arise through various processes during vinification:
During fermentation, yeasts convert sugar into alcohol and carbon dioxide. As by-products, numerous aromatic compounds are formed:
Fermentation temperature plays a major role: cool fermentation (15–18°C) in white wine preserves the fruit, while warmer fermentation (22–28°C) in red wine produces spicier notes.
Malolactic fermentation converts sharp malic acid into softer lactic acid, producing characteristic aromas in the process:
Lees ageing allows the wine to mature on dead yeast cells. The yeast gradually releases compounds (autolysis):
Ageing in barrique or other oak vessels is one of the most important sources of secondary aromas:
Secondary aromas can be grouped into categories:
Chardonnay is the prime example of secondary aromas:
Chablis (stainless steel): Minimal secondary aromas, focus on primary fruit and minerality
Burgundy Chardonnay: Intense secondary aromas from barrique, lees ageing, and malo — brioche, butter, hazelnut, vanilla
Californian Chardonnay: Often strongly pronounced butter (malo) and vanilla (barrique)
Secondary aromas are essential for the character:
Barolo: Liquorice, tar, dried herbs from long ageing in large wooden vessels
Rioja: Intense vanilla and coconut from American oak, toast from extended barrel ageing
Bordeaux: Cedarwood, spice, toast from French barrique
Burgundy Pinot Noir: Subtle spice notes, forest floor, restrained oak
The three aroma levels in wine:
| Aroma type | Origin | Examples | When dominant |
|---|---|---|---|
| Primary | From the grape | Fruit, blossoms | Young wines |
| Secondary | Through winemaking | Yeast, butter, wood | Mid-age wines |
| Tertiary | Through ageing | Honey, tobacco, leather | Mature wines |
In young wines, primary and secondary aromas dominate. With ageing, tertiary aromas develop while primary fruit fades.
The balance between primary and secondary aromas is crucial:
Good balance: Secondary aromas complement and support the primary fruit without overwhelming it. The wine shows complexity while retaining its identity.
Out of balance:
In recent years the trend has moved towards more subtle secondary aromas:
This is a reaction to the over-oaked, technically dominated wines of the 1990s and 2000s.
When tasting, ask yourself:
Nose:
Palate:
If you prefer fruity, varietally expressive wines, choose wines with minimal secondary aromas:
If you enjoy complex, creamy wines with depth, look for wines with pronounced secondary aromas:
Secondary aromas are not a quality marker per se — what matters is the balance and whether they suit the style of the wine. An over-oaked wine is not better than a fresh stainless-steel wine, just different.
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