Glera

Also known as Prosecco, Serprino, Prosecco Tondo, Prosecco Bianco.

The grape behind Prosecco — a mostly neutral white variety used above all for frizzante and spumante wines, though still versions exist. It was itself called "Prosecco" until 2009, when the EU renamed the grape variety to "Glera" specifically to free up "Prosecco" to function purely as a protected geographical wine name, preventing producers outside the zone from labeling sparkling wine "Prosecco" simply by naming the grape.

The sole or dominant base of Prosecco DOC and of the Conegliano Valdobbiadene and Colli Asolani DOCG hillside zones (identical grape and zone to Prosecco DOC's Charmat-tank wines, distinguished instead by the classic hillside method) — minimum 85% in Prosecco DOC's still, spumante, and frizzante typologies, with up to 15% of eight named complementary varieties (including Verdiso, Bianchetta Trevigiana, and Perera) allowed to round out the blend; the spumante rosé typology caps Glera at 85-90% to make room for a mandatory Pinot Nero share. Colli Euganei's disciplinare calls it by the local synonym "Serprino," canonicized here to the registered name.