What is a 'complex' wine?

When tasters call a wine 'complex,' they mean it offers layers upon layers of flavour that unfold over time. Think of it like music: a simple wine is a catchy melody, while a complex wine is a full orchestra playing a symphony with movements you did not see coming.

Complexity comes from three aroma families. Primary aromas are all about the grape itself -- fruity, floral, herbal notes. Secondary aromas develop during winemaking, like the buttery richness from malolactic fermentation or the bready character from yeast contact. Tertiary aromas emerge with ageing -- think vanilla from oak, leather, tobacco, mushroom, and truffle.

Several factors drive complexity. Low yields (often under 40 hectolitres per hectare), expressive terroir, long barrel ageing (12-24 months), and blending multiple grape varieties all add layers. Wines from Bordeaux, Barolo, Burgundy, and Châteauneuf-du-Pape are classic examples.

Here is the key nuance: complexity is not the same as power. A delicate Mosel Riesling at 8% alcohol can be stunningly complex. What matters is the number of identifiable aromas and how seamlessly they weave together. Professionals measure this partly through 'finish length' (caudalie) -- top wines often linger for 12-15 seconds or more.

Next time you open a bottle, pour a small amount, swirl, and smell it every 5 minutes over half an hour. If new aromas keep appearing -- dried fruit replacing fresh fruit, a whiff of spice sneaking in -- you are experiencing complexity in action.