Why does Stellenbosch Cabernet and Cape Bordeaux blends taste like that?

Characteristically medium-plus tannin, medium-plus acidity and medium-full body. Commonly associated with blackcurrant, black cherry, cedar, graphite.

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 acidity. Commonly associated with raspberry, red plum, graphite, bell pepper.

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-full body. Commonly associated with plum, black cherry, chocolate, cedar.

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.

Proximity to a large body of water moderates temperature extremes, which is associated with a longer, more even ripening period and a lower risk of both spring frost and extreme summer heat.

Varies: Maritime influence also raises humidity, which raises fungal disease pressure. It is not uniformly an advantage.

Not claiming: That a maritime climate is cool. Maritime describes variability, not temperature.

A Mediterranean pattern of wet winters and dry summers is associated with reliable ripening and with mild late-season water stress, which restricts berry size and raises the ratio of skin to juice.

Varies: Where the dry season is severe or lengthening, the same pattern produces damaging rather than beneficial stress, and irrigation becomes necessary rather than optional.

Not claiming: That water stress is beneficial as such. Mild stress helps; severe stress halts ripening.

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.

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.

Combining components to make something better than any of them alone.

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

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.

Eight to fifteen years. Stellenbosch mountain fruit gives firm, savoury tannin that genuinely needs the time; wines from the valley floor do not.

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.