Tannat

Identity

Tannat is a very tannic variety: coloured, nervy wines with pronounced astringency, long dismissed as rustic before the best Madiran cuvées proved capable of the power, structure and long ageing associated with serious reds. Its name is often linked to the French word tanin; that etymology is not established.

Micro-oxygenation was developed at Madiran in the early 1990s precisely to soften that tannin.

History and origin

The Vitis International Variety Catalogue (VIVC, n° 12257) documents no full pedigree for this variety: no cross is established by genetic markers, even though Tannat itself appears as a parent of other varieties in the database — without those being specified. Its recorded country of origin is France, which Pl@ntGrape narrows only to the "Pyrenean vineyard".

The VIVC records thirteen synonyms, which trace the map of its diffusion across the Pyrenees and beyond: "Moustrou" in Béarn, "Bordeleza Belcha" in the Basque Country, and above all "Harriague" — the name under which the variety is known in Uruguay, where Basque winegrower Pascual Harriague introduced it in the nineteenth century and where it is now regarded as the country's signature grape.

In the vineyard

Per Pl@ntGrape (no. 268), Tannat buds roughly four days after Chasselas, the reference variety, like Cot, and ripens in the second époque, roughly three and a half weeks after it. It is described as "fairly vigorous", not to be confused with its production level, "medium to above-average" depending on clone.

The variety is susceptible to mites and leafhoppers, and slightly susceptible to grey rot; it is usually trained with long pruning.

In the glass

On the nose, dense black fruit: blackberry, blackcurrant, a touch of over-ripe black fruit and a floral note of violet. Secondary notes of black pepper and liquorice often accompany the fruit. Oak ageing, near-systematic at Madiran, brings notes of cocoa and vanilla; with age come leather and tobacco leaf.

On the palate, acidity is firm (4 out of 5), tannin sits at the top of the scale (5 out of 5) — the variety's defining trait —, body is ample (4 to 5) and alcohol generous (3 to 4). The best cuvées keep for a decade, longer in great vintages.

Taming a tannin judged too rustic

This pronounced astringency did not go without a technical answer. In the early 1990s, micro-oxygenation was developed at Madiran: a controlled, very low-flow addition of oxygen during fermentation or ageing, meant to polymerise Tannat's roughest tannins and stabilise colour. The technique, documented by The Oxford Companion to Wine, was authorised in the European Union in 1996 and has since spread well beyond the Sud-Ouest.

Great terroirs

Madiran is Tannat's reference terroir: the appellation's cahier des charges, homologated by the arrêté of 26 November 2025, makes it the compulsory principal variety, required to make up at least 60% of the red blend, alongside accessory varieties such as Cabernet Franc, Cabernet Sauvignon, Fer and Manseng Noir. More broadly, Tannat is one of the signature varieties of the Sud-Ouest, alongside Cot, Fer Servadou and the Manseng varieties.

What gets confused with it

Cot (Malbec), likewise a signature Sud-Ouest variety, shares with Tannat a deep colour and marked tannin, but is generally less astringent and less acidic. Mourvèdre, another tannic grape of southern France, ripens later and leans more toward garrigue.