Unlike Champagne and
Franciacorta DOCG, Prosecco is usually produced using the alternative
Charmat–Martinotti method, in which the secondary fermentation takes place in large stainless steel tanks rather than in each individual bottle, making the wine less expensive to produce, and the minimum production time is 30 days. Higher quality Prosecco using this method will ferment the wine over a longer period, up to around 9 months (Charmat Lungo). Nevertheless, the production rules for both the DOCG's also allow the use of the
traditional method of secondary fermentation in the bottle, known in Italy as Metodo Classico. DOC and DOCG rules allow up to 15% of Prosecco wine to be a blend of Verdiso, Bianchetta Trevigiana, Perera,
Chardonnay,
Pinot bianco,
Pinot grigio, or
Pinot nero (vinified white). Approximately 150 million bottles of Prosecco were produced in 2008. Since the 2000s, Glera grapes are cultivated and wine produced in other countries, including Brazil, Romania, Argentina, and Australia. and together they form the Consortium for the Protection of Prosecco from Conegliano and Valdobbiadene (Consorzio per la Tutela del Prosecco di Conegliano e Valdobbiadene). DOCG also has its own consorzio, with 94 producers.
Prosecco DOC Most Prosecco, whether DOC or DOCG, is made as Spumante
sparkling wine or Frizzante (semi-sparkling). Prosecco DOC Spumante is the most famous and popular variety, with longer-lasting bubbles. Prosecco DOC Frizzante has bubbles that linger for a shorter time. A small proportion is made as Tranquillo (
still wine), with no bubbles. Extra-Dry has been the dominant style made, but the amount of Brut is now increasing. Glera grapes made in a Prosecco style outside the DOC/DOCG have a non-protected designation, such as "IGT Veneto", are generally cheaper and of more variable quality and cannot be called Prosecco.
Prosecco Superiore DOCG There are two Prosecco Superiore DOCGs, divided by the
River Piave, in the
province of Treviso, Veneto. Prosecco Conegliano Valdobbiadene Superiore DOCG is made on the hills between the
comuni (municipalities) of
Conegliano,
Valdobbiadene, and
Vittorio Veneto. Producers from Valdobbiadene have recently tended to skip mention of Conegliano on their front label, calling their wine
Valdobbiadene Prosecco Superiore. The second DOCG is the smaller Asolo Prosecco Superiore DOCG, produced on the hills near the
comune of Asolo. Currently, in addition to the usual range of Prosecco styles, Asolo DOCG can also make an "Extra-Brut" (0-6 g/L), and Conegliano Valdobbiadene is expected to introduce this style soon. While the bulk of Prosecco DOC is grown on low-lying plains in an extended area covering 23,300 hectares, the DOCG Prosecco Superiore is grown exclusively on hillside vineyards in two far smaller growing areas, 6,860 hectares for Conegliano Valdobbiadene and 1,783 hectares for Asolo. The steepness of the hills means that everything, from pruning to picking, is principally done by hand. The manual aspect, especially for the harvest, further increases quality. owned by 140 growers. or even the
"Grand Cru" of Prosecco. Theoretically, a hectare of Cartizze grape land was estimated to be worth in excess of 1 million US dollars in 2008 According to a local legend, Cartizze grapes traditionally were harvested last, as the vines were situated on steep slopes and hard to reach, which led to vintners discovering that this extended ripening period improved the flavour.
Rive subzones While Cartizze is a subzone at the top of the Prosecco Conegliano Valdobbiadene Superiore DOCG quality pyramid, their Consorzio has also introduced official
Rive delimitations, i.e. 15 communes that can make 43 different Rive subzone wines. These are named after the individual hills where the grapes originate, though this adds complexity and adoption so far is patchy. The intention is to highlight the different
microclimates and distinct
terroirs found in the DOCG. Asolo Superiore DOCG has not introduced subzones.
Col Fondo Some winemakers are reviving the traditional Prosecco Col Fondo, refermented in the bottle but not disgorged, as the wines are left on their
lees. This yeasty residue leaves fine sediment in the bottom of the bottle (Italian:
fondo) that imparts more complexity, texture and flavour. They can be served either clear or cloudy. These wines are labelled Conegliano Valdobbiadene Superiore DOCG, or Asolo Superiore DOCG. Col Fondo generally has a lower Frizzante-style of pressure. ==Consumption==