The Trebbiano group of grape varieties includes Trebbiano Abruzzese, Trebbiano Toscano, Trebbiano Romagnolo, and Trebbiano Spoletino. Apart from the genetic tie between Trebbiano Abruzzese and Trebbiano Spoletino, Trebbiano group members are, for the most part, unrelated genetically. In the vineyard however they are all characterized by high vigor and yield, long and large bunches, late-ripening and very adaptive to different terroirs. This explains why over the centuries these altogether di!erent varieties have been lumped together into a generic Trebbiano group.