Erbaluce

The name first turns up in print as Elbalus, in a 1606 treatise on the wines of the hills around Turin, which makes Erbaluce one of the northwest's better-documented old varieties. It is usually read as alba luce, "white light" or "dawn light", an allusion to the glow of ripe berries; this is an etymology, not a proven derivation. The variety is believed to have originated in the Canavese, the morainic foothill country lying between Ivrea and Turin.

DNA profiling points to a close relationship between Erbaluce and Cascarolo Bianco, another old Piedmontese white. Cascarolo Bianco is itself regarded as a descendant of the Swiss grape Rèze, but whether Erbaluce is its parent, offspring or sibling has not been settled. A suggested kinship with Clairette, built on an early marker study and on a similar meaning of the name, has never been confirmed.

Erbaluce has no connection to the southern Italian Greco, even though growers around Novara have called it Greco or Greco Bianco (probably a nod to sweet wines in the Greek tradition). Its other local names include Albaluce, Bianchera, Bian Rustì and Uva Rustìa; the last two allude to the amber, "roasted" colour of ripe berries.

Erbaluce is vigorous and, in the Canavese, is often trained on the topia, a pergola system that lifts the canopy and helps air movement in a cool, humid foothill climate. Berries have thick skins and turn amber as they ripen. Ripening is early to mid season, and acidity stays high at maturity, which is the property growers and winemakers value most. The main vineyard weakness is poor resistance to powdery mildew, so canopy management and timely spraying matter. The DOCG rules favour well-exposed hillside sites on soils of glacial (morainic) origin between 200 and 500 m, set a ceiling of 11 t/ha for all four wine types, and ban forcing practices. The thick skins also tolerate the long post-harvest drying used for passito.

Dry Erbaluce di Caluso must reach at least 11% total alcohol and 5 g/L total acidity. Style ranges from taut, stainless-steel whites with citrus and almond notes to fuller, lees-aged or barrel-influenced versions with more weight and a mineral finish. Spumante is made by the traditional method with a minimum of 15 months on the lees; the high natural acidity suits a fine, dry, lemony sparkling wine. Passito is the historic prestige wine: bunches are dried on racks or hung from beams until the must reaches at least 29% sugar, with drying that may run into late winter. The finished wine must reach 17% total alcohol with at least 70 g/L residual sugar and age for at least three years (four for the riserva) before sale, yielding amber, honeyed wines with dried fig, saffron and orange peel balanced by acidity.