Ugni Blanc

Identity

Ugni Blanc is the most planted white grape in France — 87,039 hectares in 2018 — and also the one least talked about. The reason fits in a sentence: it barely smells of anything. Where this corpus describes Riesling through eight aromas and Chenin through as many, Ugni Blanc carries one, at minimum intensity, and that is not a gap in the entry.

This neutrality is precisely its qualification. A neutral wine, low in alcohol and very high in acid, makes a poor table wine and excellent material to distil. Ugni Blanc was not chosen despite what it is; it was chosen for it.

History and origin

Native to Tuscany, where it is called Trebbiano Toscano, it reached France and took the name Ugni Blanc — and, in parts of the Charentes, Saint-Émilion, a name with no connection to the Bordeaux appellation.

Its dominance is recent and it has a precise cause. Before phylloxera, the Charentes distilled mostly Folle Blanche and Colombard. Rebuilding the vineyard by grafting onto American rootstock weakened those varieties, and the "Cognac" cahier des charges says so plainly: Ugni Blanc "proved more resistant than the traditional varieties used before the phylloxera crisis (Colombard, Folle Blanche, and so on), weakened by grafting". It was following the work of Cognac's station viticole — a viticulture committee in 1888, a research station in 1892 — that it became, around the middle of the twentieth century, the overwhelmingly dominant variety.

The curve of its plantings tells the rest: 62,399 hectares in 1958, a peak of 127,468 in 1979, a long contraction to 83,182 in 2008, then a recovery to 87,039 in 2018 carried by cognac exports.

In the vineyard

It buds nine days after Chasselas — late, which puts it well clear of spring frosts — and ripens three and a half to four weeks after it. That late ripening is the second half of the reasoning: the "Cognac" cahier des charges justifies its varieties by "high productivity and late ripening, which offer many advantages for producing quality distillation wines that are low in alcohol and high in acid". A grape that finishes late and carries a heavy crop does not pile up sugar and does not lose its acid. That is exactly what is asked of it.

It is very vigorous and takes to a wide range of training and pruning systems. It dislikes wind, hence the value of trellising. It is susceptible to downy mildew and eutypa dieback, and very susceptible to root-knot nematodes when grown ungrafted on sand; it is, on the other hand, fairly resistant to phomopsis and to grey rot on the bunch.

In the glass

As a still wine, not much. Pl@ntGrape stops at "relatively neutral but balanced dry white wines" and gives no aroma descriptor at all. This corpus attributes a single one, lemon, at the lowest intensity — and even then it is less a characterised varietal aroma than what the acidity gives you to read.

That acidity, by contrast, is measurable and it is regulated. The "Cognac" cahier des charges sets, for the wine at the moment it is charged into the still, a minimum alcoholic strength of 7% and a maximum of 12% by volume, and a maximum volatile acidity of 12.25 milliequivalents per litre. A wine at 9% that came in at 13 would, here, be worse.

What follows no longer belongs to the grape. The wine is double-distilled — two heatings — in a copper alambic charentais, to a maximum of 73.7% abv, no later than 31 March of the year after the harvest, then aged for at least two years. The aromas credited to cognac are those of that transformation, not those of the fruit.

Great terroirs

The Charentes first, and by a long way. The vineyard dedicated to "Cognac" covers roughly 75,000 hectares, or 95% of the vineyard in the area, and Ugni Blanc accounts for close to 98% of what is planted. The cahier des charges names it a principal variety alongside Colombard, Folle Blanche, Montils and Semillon; Folignan and Monbadon are accessory varieties, and Coutia, Luminan and Vidal appear only as varieties of interest for adaptation purposes, under agreement — so they are not part of the blend in the strict sense.

In Provence its role is quite different and far more modest: a principal variety for the whites of Bandol alongside Clairette and Bourboulenc, an accessory variety at Cassis and Palette, and at Côtes de Provence a supporting grape capped at 20% combined with Clairette, Semillon and Vermentino. There, it brings acidity to southern whites that lack it.

In Armagnac, finally, the text is more egalitarian than in the Charentes. The cahier des charges approved by the order of 27 March 2025 gives a single, unranked list of ten varieties — Baco Blanc, Blanc Dame, Colombard, Folle Blanche, Graisse, Jurançon, Mauzac, Mauzac Rose, Meslier Saint-François and Ugni Blanc — without the principal-and-accessory split Cognac uses. The text nonetheless calls Ugni Blanc "one of Armagnac's major varieties".

The difference from the Charentes comes down to one man and one soil. The same cahier des charges recalls that "in 1898, a Landes ampelographer, François Baco, succeeded in selecting a new variety for Armagnac, highly resistant to disease and very well suited to the sand and boulbène soils". Where Cognac answered phylloxera by changing which traditional grape it grew, Gascony answered it by creating one.

What it gets confused with

The trap is not a grape, it is a name. "Trebbiano" is not a variety but a family of names, and the Italian wines that carry it come from genetically distinct grapes: Trebbiano di Lugana is Turbiana, Trebbiano d'Abruzzo and Trebbiano Romagnolo are something else again. The published aroma-profile studies on "Trebbiano" are about those varieties. Transposing them to Ugni Blanc would be a mistake of homonymy, not a shortcut.

A second homonym runs the other way: the VIVC lists "Ugni Blanc" among the forty-one synonyms of Macabeo (Viura). This corpus treats the two as different varieties — the Charentais use of the name for Macabeo is a regional accident, not an identity established by markers.

As for the name Saint-Émilion used in the Charentes, it plainly does not refer to the Merlot or Cabernet Franc of the Bordeaux appellation.