Incrocio Manzoni or Manzoni grapes is a family of grape varieties named after Professor Luigi Manzoni (1888-1968) of Italy's oldest school of oenology located in Conegliano, in the Veneto region. Manzoni created the new grape varieties by selecting, crossing and grafting vines from various vineyards during the 1920s and 1930s. The family includes both white and red grape varieties. Although most Manzonis are grown in northeastern Italy, they are mainly grown in the Piave area of Province of Treviso and are only now starting to be sold commercially in Europe and the United States. Naming convention The name Incrocio is Italian for crossing with the second part of the name usually being the last name of the grape breeder. These means that not every Incrocio grape variety are Manzoni grapes with varieties such as Incrocio bianco Fedit 51 (a Garganega and Malvasia bianca Lunga crossing), Incrocio Bruni 54 (a Sauvignon blanc and Verdicchio crossing) and Incrocio Terzi 1 (a Barbera and Cabernet Franc crossing) being mostly unrelated to Professor Manzoni or his crossings. The numbers after grape type refer to location of the vineyards for the original grafts; for example, 6.0.13 refers to the row, vine and vineyard. Grape varieties There are several different Incrocio Manzoni grapes which have been selected for cultivation. The two most successful are Manzoni bianco and Manzoni Moscato which are most commonly known under their non-numerical designations, while the others have not had as much success and are rare in plantation. Incrocio Manzoni 2.15 Incrocio Manzoni 2.15 or Manzoni 2.15, is a red variety which is a cross of Glera (formerly known as Prosecco) and Cabernet Sauvignon that was produced during a series of trials between 1924 and 1930. It is also known under the synonyms I.M. 2.15, Manzoni 2-15, Manzoni nero, Manzoni rosso, and Prosecco × Cabernet Sauvignon 2-15. Professor Manzoni's original intent was to create a white wine grape variety from a crossing of Prosecco and Sauvignon blanc but ended up using pollen from Cabernet Sauvignon which resulted in a black-skinned grape variety. Manzoni 2.15 is a winter-hardy grape variety with good frost resistance that can be very vigorous unless kept in check by winter pruning, vine training and leaf-pulling. Like its parent, Cabernet Sauvignon, it is a late ripening grape that needs a long growing season to achieve full physiological ripeness. In 2000 there were of Manzoni 2.15 planted mostly in the