Quick answer: A complex wine has multiple distinct layers of aroma and flavor. You might notice fruit, flowers, herbs, spice, or earthy notes, with different characteristics revealing themselves as you smell and taste. Complexity can come from the grapes, vineyard, winemaking, and bottle aging. It is one aspect of quality, rather than a guarantee that you’ll enjoy a wine more.
Some wines make an immediate, straightforward impression: fresh cherries, perhaps, or bright citrus. Others give you more to explore. You notice fruit first, then flowers, then a savory or earthy note that wasn’t obvious a moment ago.
That sense of discovery is what wine professionals mean when they talk about complexity.
Where does complexity in wine come from?
A useful way to understand a wine’s layers is to divide its aromas and flavors into three groups.
Primary aromas come from the grapes
These include fruit, floral, and herbal characteristics. You might notice cherry, blackberry, citrus, rose, or fresh herbs.
The grape variety and where it grows help shape these characteristics. A wine can show several primary aromas and be interesting to explore even when it is young.
Secondary aromas develop through winemaking
Fermentation and aging choices can add another set of characteristics.
Oak can contribute vanilla, toast, or spice. Aging on lees—the yeast sediment left after fermentation—can contribute bread or brioche notes. Malolactic fermentation can produce buttery aromas.
These characteristics can add layers, but more oak or a stronger buttery flavor does not automatically make a wine more complex. The interest comes from how the different elements work together.
Tertiary aromas develop with age
As some wines mature, their youthful fruit character evolves and other aromas become more noticeable.
Depending on the wine, these might include dried fruit, leather, tobacco, mushroom, honey, or nuts. Mature Bordeaux and Burgundy are familiar examples of wines that can develop these additional layers.
A wine does not need to display all three groups to be complex.
How can you recognize complexity in your glass?
Give the wine your attention over more than one sip.
Start by smelling it. Before trying to identify an exact fruit or spice, think in broad categories. Is the wine fruity, floral, herbal, earthy, or toasty? Can you notice more than one?
Take a sip and follow the flavors. Does the first impression continue unchanged, or do other characteristics emerge? Perhaps the wine starts with fruit and leaves a savory or spicy impression.
Return to the glass. Smell and taste it again after 10 or 20 minutes. Some wines reveal additional aromas as they spend time in the glass.
Change over time can help you notice complexity, but it isn’t a pass-or-fail test. A wine can already be expressive when first poured.
You also don’t need an elaborate tasting vocabulary. “I notice something floral behind the fruit” is a useful observation.
Is a complex wine always better?
No. Complexity is one quality to consider alongside balance, intensity, and finish.
A wine can offer plenty of aromas yet feel harsh, overly alcoholic, or disjointed. A simpler wine can be well made, refreshing, and exactly what you want to drink.
Complexity also differs from intensity. A very strong blackberry flavor is intense; several distinct, interacting flavors suggest complexity.
Likewise, a long finish and a full body are separate characteristics. Neither automatically makes a wine complex.
Do wines become more complex as they age?
Some do, but aging is not a universal improvement.
Wines suited to cellaring can develop new aromas as their fruit and structure evolve. Many other wines are made to be enjoyed young, when their fresh fruit character is most appealing. Holding them longer may mean losing that freshness without gaining interesting new layers.
Age alone does not tell you whether a bottle will be good. The particular wine, its condition, and how it has been stored all matter.
If you want to explore complexity, start by spending a little more time with your next glass. Notice what appears first, what emerges later, and whether the wine keeps giving you something new to consider.