Glera Framework

Glera expresses three distinct stylistic identities across the Prosecco quality pyramid, each tied to geography and DOC/DOCG regulation. Prosecco DOC at the base spans approximately 28,100 hectares across nine provinces in Veneto and Friuli-Venezia Giulia (Belluno, Gorizia, Padova, Pordenone, Treviso, Trieste, Udine, Venezia, Vicenza); production reaches roughly 660 million bottles annually from flatland and gentle foothill sites with yields capped at 18 t/ha. Asolo Prosecco DOCG, the smaller hillside DOCG, covers approximately 2,000 hectares across 19 communes in the Colli Asolani south of the Dolomites; tighter 12 t/ha yields produce a structured, mineral-driven profile from 150-500 metre elevations. Conegliano Valdobbiadene Prosecco Superiore DOCG, the UNESCO-listed grand zone, spans 8,667 hectares across 15 communes between Conegliano and Valdobbiadene; 13.5 t/ha yields and the steepest hogback hillsides produce the finest and most age-worthy Glera, with the 107-hectare Cartizze grand cru and 43 single-commune Rive bottlings forming the top tier.

• Prosecco DOC (base): 28,100 hectares across 9 provinces in Veneto + Friuli-Venezia Giulia; 18 t/ha yields; 660 million bottles in 2024
• Asolo Prosecco DOCG (hillside): 2,000 hectares across 19 communes; 12 t/ha yields (tightest in family); 12-15 million bottles annually
• Conegliano Valdobbiadene Prosecco Superiore DOCG (UNESCO hillside): 8,667 hectares across 15 communes; 13.5 t/ha yields; ~90 million bottles annually
• Cartizze grand cru (107 hectares, ~140 landowners, 1.2 million bottles/year) and 43 single-commune Rive bottlings: top tier within Conegliano Valdobbiadene DOCG

Glera is a semi-aromatic variety whose character is strongly shaped by site and yield management. On hillside vineyards with controlled yields it expresses delicate, fresh aromas of white flowers (acacia blossom, hawthorn), lemon, pear, green apple, and white peach. On flat land or at high yields the wine becomes progressively more neutral. The variety's naturally high acidity (typically 5-7 g/L total acidity, with pH 3.0-3.3) and moderate alcohol potential make it ideally suited to the Charmat tank method, which preserves these delicate primary aromatics rather than building autolytic complexity through extended bottle aging. The distinctive 'green-apple-pear' aromatic signature derives from terpene compounds expressed at moderate ripeness; over-ripe Glera loses this character and becomes generic. The 33 cru sub-zones of Conegliano Valdobbiadene (43 Rive plus Cartizze) and the named subzones of Asolo express significant terroir variation: cool higher-elevation hillside sites produce mineral-driven, chalky-citrus expressions; warmer lower sites give richer stone fruit. Cartizze grand cru's ancient moraines, sandstone, and clay produce notable floral perfume and structural finesse.

• Primary aromatics on hillside-grown fruit: white flowers (acacia blossom, hawthorn), lemon, pear, green apple, white peach
• Naturally high acidity (5-7 g/L TA, pH 3.0-3.3) and moderate alcohol potential; suits tank fermentation that preserves primary character
• Terpene-driven 'green-apple-pear' signature; expressed at moderate ripeness; over-ripe Glera loses this character
• Terroir variation: cool higher-elevation sites give mineral-driven chalky-citrus; warmer lower sites give richer stone fruit; Cartizze ancient moraines give floral perfume

Virtually all commercially produced Prosecco is made using the Charmat method (Martinotti method in Italy), in which secondary fermentation occurs in pressurised stainless steel autoclave tanks rather than individual bottles. This technique was invented and patented by Federico Martinotti in 1895; Frenchman Eugène Charmat refined and re-patented the process in 1907, lending his name to the method internationally. The technique is particularly well-suited to Glera because it preserves the variety's delicate primary fruit and floral aromatics, which would be overshadowed by the biscuit and brioche complexity that bottle fermentation produces. Style range depends on dosage: Brut Nature (0-3 g/L residual sugar), Extra Brut (0-6 g/L), Brut (up to 12 g/L, the dominant modern global export style), Extra Dry (12-17 g/L, the historical dominant Italian style), and Dry (17-32 g/L, the traditional Cartizze grand cru style). Frizzante (light effervescence, ~2.5 atmospheres pressure) and Spumante (full sparkling, 3+ atmospheres) styles both exist; Spumante is dominant. Col Fondo is a small but growing artisan category: bottle-refermented Glera left on lees, producing a hazy, yeasty, fully dry frizzante.

• Charmat (Martinotti) method: secondary fermentation in pressurised stainless steel autoclave tanks; patented 1895 by Federico Martinotti; refined 1907 by Eugène Charmat
• Tank fermentation preserves Glera's delicate primary fruit and floral aromatics; bottle fermentation autolytic complexity would mask the variety's character
• Dosage range: Brut Nature (0-3 g/L), Extra Brut (0-6 g/L), Brut (up to 12 g/L, dominant modern style), Extra Dry (12-17 g/L, historical Italian style), Dry (17-32 g/L, Cartizze traditional)
• Spumante (3+ atm pressure) dominates commercial production; Frizzante (~2.5 atm) is smaller traditional category; Col Fondo (bottle-refermented with lees) is a growing artisan niche

Prosecco DOC Rosé was officially introduced in 2020 after years of producer lobbying, representing a significant category expansion. The rules require 85-90% Glera and 10-15% Pinot Noir (Pinot Nero) vinified red, must be vintage-dated (the first vintage-dated Prosecco rule), and require a minimum 60 days of secondary fermentation (longer than standard Prosecco). The colour ranges from light salmon to pale onion-skin. Production reached approximately 80 million bottles in 2024, demonstrating strong market traction. The DOCG hillside zones (Asolo and Conegliano Valdobbiadene) do not produce rosé under their DOCG designations; rosé is exclusively a Prosecco DOC product. The 2020 launch reflected long-running pressure from producers to formalise what had previously been unofficial Glera-Pinot Nero blends, and to capture the growing global rosé market segment.

• Prosecco DOC Rosé introduced 2020: 85-90% Glera + 10-15% Pinot Noir vinified red; must be vintage-dated; minimum 60 days secondary fermentation
• Colour range: light salmon to pale onion-skin; production reached ~80 million bottles in 2024
• Rosé is exclusively a Prosecco DOC product; DOCG hillside zones (Asolo, Conegliano Valdobbiadene) do not produce rosé under their DOCG designations
• Reflects long producer pressure to formalise unofficial Glera-Pinot Nero blends and to capture growing global rosé market segment

The Glera/Prosecco category spans from large industrial producers to small artisan estates across the three tiers. At the broad Prosecco DOC: Mionetto (founded 1887), Zonin, La Marca, Riondo, and Carpenè Malvolti (Italy's oldest sparkling house, founded 1868 in Conegliano) drive commercial volumes. At Asolo Prosecco DOCG: Bele Casel (Caerano di San Marco, since 1979), Montelvini (since 1881), Bellussera, and Cirotto. At Conegliano Valdobbiadene Prosecco Superiore DOCG: Bisol (15 generations since 1542, benchmark Cartizze), Nino Franco (since 1919, defines export Valdobbiadene), Bortolomiol (since 1949), Adami (since 1933 in Vidor), Ruggeri (since 1950), Col Vetoraz (since 1993), Andreola (Rive specialist), and Valdo. The Consorzio di Tutela del Prosecco DOC oversees the broader DOC; separate Consorzia oversee Asolo and Conegliano Valdobbiadene DOCG zones. Strada del Prosecco, established in 1966 as Italy's first wine route, links Conegliano to Valdobbiadene through 30 communes.

• Prosecco DOC commercial leaders: Mionetto (founded 1887), Zonin, La Marca, Riondo, Carpenè Malvolti (Italy's oldest sparkling house, founded 1868)
• Asolo Prosecco DOCG quality producers: Bele Casel (founded 1979), Montelvini (founded 1881), Bellussera, Cirotto
• Conegliano Valdobbiadene Prosecco Superiore DOCG benchmark: Bisol (15 generations since 1542), Nino Franco (since 1919), Bortolomiol (1949), Adami (1933), Ruggeri (1950), Col Vetoraz (1993)
• Strada del Prosecco (established 1966): Italy's first wine route; links Conegliano to Valdobbiadene through 30 communes