Why does Port taste like that?

Characteristically high tannin, medium-plus acidity and full body. Commonly associated with violet, bergamot, blackberry, blueberry.

Not claiming: That every wine from this variety shows these characteristics. This is the range across the category, and site and winemaking move wines within and beyond it.

Characteristically medium-plus tannin and medium-full body. Commonly associated with red cherry, dried strawberry, leather, tobacco.

Not claiming: That every wine from this variety shows these characteristics. This is the range across the category, and site and winemaking move wines within and beyond it.

Characteristically medium-plus tannin, medium-plus acidity and medium-full body. Commonly associated with red berry, rose, blackberry, sweet spice.

Not claiming: That every wine from this variety shows these characteristics. This is the range across the category, and site and winemaking move wines within and beyond it.

Warmer growing seasons are associated with faster sugar accumulation and lower retained acidity, so fruit reaches a given potential alcohol earlier in the season.

Varies: Above the vine’s photosynthetic optimum the relationship reverses: extreme heat stalls ripening, inhibits anthocyanin synthesis and can raise sugar only through berry dehydration.

Not claiming: That warm regions necessarily make high-alcohol wine. Potential alcohol at any moment is a choice point; the producer decides when to pick.

A wide day–night temperature range is associated with better acid retention, because cool nights slow the respiration that consumes malic acid while warm days continue to ripen the fruit.

Not claiming: That altitude or continentality guarantees high acidity. Both widen diurnal range on average and neither determines the outcome.

Adding spirit raises alcohol above the level yeast can tolerate. Added during fermentation it halts the process, leaving unfermented grape sugar in the wine — which is why Port is sweet. Added after fermentation has finished, the wine remains as dry as it already was, which is the Sherry case.

Varies: Timing is the whole variable. The same operation on the same wine a week apart produces a sweet fortified wine or a dry one.

Not claiming: That fortification produces sweetness. It produces sweetness only when it interrupts a fermentation that still has sugar to work on.

Vanillin and oak lactones are extracted from oak into the wine, in quantities that fall sharply with each use of a barrel.

Varies: Species, grain, seasoning, toast level, barrel size and the age of the barrel all change what is extracted and how much.

Not claiming: That oak produces buttery character. That comes from malolactic fermentation. Nor that a given oak origin yields a given flavour.

Slow oxygen ingress through the staves and bung promotes polymerisation of tannins and anthocyanins, which stabilises colour and is generally associated with a softer perception of tannin.

Not claiming: That an old barrel is equivalent to a steel tank. Aromatic extraction falls with use; oxygen permeability does not.

Rioja’s ageing classifications set minimum periods in oak and in bottle, so extended oak maturation is a legal requirement for the higher tiers rather than only a stylistic choice.

Not claiming: That Tempranillo requires oak, or that the convention applies outside the regions that codify it.

Depends entirely on the tier. Ruby and Tawny are sold ready; Vintage Port declared in the best years is bottled young and unfiltered and needs fifteen to twenty years before it is worth opening, then keeps for decades more.

Not claiming: That a wine of this style will develop these characters. Ageing potential varies by producer, vintage and storage, and most wine is better young.