The Grenache is grown in southern France, where it is partly responsible for the wines of Chateauneuf-du-Pape, Tavel, and many others.  It is the mainstay of Rioja, makes port-style and light rose wines in California, and is also grown in South Africa.  Its wines are rich, warm, and alcoholic, sometimes too much so, and require blending with other varieties.  The true Grenache has nothing to do with the Grenache de Logrono of Spain, which is, in fact, the Tempranillo or Tinto de Rioja.  Some sources say the Alicante (a synonym of the Grenache) is the Alicante Bouschet (or plain Bouschet in California), but this too is misleading.

Info : The Sotheby's Wine Encyclopedia 4th Ed by Tom Stevenson