1) White wine grape variety 
Courbu is the name of three different, but related varieties of wine grapes primarily found in South West France. All are Vitis vinifera grapes. The name Courbu, without suffix, can refer to both Petit Courbu and Courbu blanc, and not all sources differ between the two. == Petit Courbu == Petit Courbu is a white wine grape from Gascony with a long...