Glera, formerly known as Prosecco, falls under two DOC appellations, Prosecco di Conegliano Valdobbiadene and Prosecco di Montello e dei Colli Asolani; both permit blending with small quantities of other white varieties. Glera produces primarily sparkling or frizzante wines, but also still wines and may be dry and light bodied, semisweet or sweet.
Glera is a cool climate vine and is fairly hardy and productive. It is late ripening and requires long hang time in moderately dry, hillside microclimates. The fruit is high in acid and low in alcohol and extract, with fairly neutral aromas.
Glera is an old northeastern Italian variety of uncertain origin, possibly native to the zone of Prosecco, from which its most notable wine takes its name. The vine is almost exclusive to the province of Treviso in the Veneto, north of Venice. It is also grown in Croatia, where is is vinified as a rosé.