Why does Vintage 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-plus acidity. Commonly associated with red berry, spice, dried herbs.

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.

Fermenting on the skins extracts phenolic compounds, including the tannins that produce astringency. Extraction rises with time, temperature and alcohol level.

Varies: Extraction is not linear. Anthocyanins come out early and quickly; tannins continue throughout and beyond fermentation, and post-fermentation maceration can reduce perceived astringency by polymerising them.

Not claiming: That longer maceration always means more perceived tannin. Extended maceration frequently softens a wine rather than hardening it.

Anthocyanins are extracted from black grape skins during skin contact, which is where red wine colour comes from. Most extraction happens in the first days.

Not claiming: That colour depth indicates quality or body. Nebbiolo is pale and highly tannic; deeply coloured wines can be light-bodied.

Stopping fermentation early to leave natural sugar in the wine.

Not claiming: That every producer of this style uses this method, or that using it is required.

Typically needs fifteen to twenty years, and the best last half a century or 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.