the dominant style made, but the amount of Brut is now increasing. Glera grapes made in a Prosecco style outside the DOC/DOCG has a non-protected designation, such as "IGT Veneto", are generally cheaper and of more variable quality and cannot be called Prosecco. While all Prosecco is currently vinified white, a rosé version has been proposed, but only for the DOC, as it was rejected by the DOCG. It is likely that such a rosé, which would include a small proportion of Pinot Noir vinified red, will be adopted only at the DOC level from the 2019 harvest and therefore be available to buy from as early as January 2020. Prosecco Superiore DOCG There are two Prosecco Superiore DOCGs, divided by the River Piave, in the Treviso province of Veneto. Prosecco Conegliano Valdobbiadene Superiore DOCG is made on the hills between the towns 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 town 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. Superiore di Cartizze subzone The hill of Cartizze is a high vineyard of of vines, owned by 140 growers. The Prosecco from its grapes, of which comparatively little is produced, is widely considered to be of the highest quality, 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 and its value was estimated to have increased to 1.5–2 million euros in 2015, the most for a vineyard in Italy. The sparkling wine produced from Cartizze has recently been named by producers as Superiore di Cartizze, without mentioning Prosecco on the front label