Lambrusco is one of the most widely discussed and maligned grape varieties grown in Italy, together with Albana and Pinot Grigio. There are many different grapes with Lambrusco as part of their name, mostly grown in Emilia Romagna but not all. It is likely that they are related to a wild grapevine that was already known to both Pliny and Virgil in antiquity. The first one mentioned today in fact does not grow in Emilia but in Piedmont and Lombardy. It was much more amply planted before phylloxera hit but after was less widely seen. Today it is often blended with Barbera, Dolcetto, Freisa and Bonarda.
The latter grape, Lambrusco a Foglia Frastagliata is grown in Trentino and is more widely known by the name Enantio. I actually tried this wine a few years ago but only recently learned of its connection to Lambrusco. This one is often used for making rose wines.
A fellow blogger who often writes on Italian wines, Jennifer Martin on Vino Travels published this article on Lambrusco ahead of Lambrusco day which was apparently June 20. It’s a good read and a good primer on Lambrusco.