Grenache (/ɡrəˈnɑːʃ/) or Garnacha (. [ɡarˈnatʃa]) is one of the most widely planted red wine grape varieties in the world. It ripens late, so it needs hot, dry conditions such as those found in Spain, where the grape most likely originated.It is also grown in Sardinia, the south of France, Australia, and California 's San Joaquin Valley.ntil the mid 20th century, Grenache was Australia's most widely planted red wine grape variety with significant plantings in the vast Riverland region where it was vital component in the fortified port-style wines of the early Australian industry.