California as a wine producing region has grown in size and importance considerably over the past couple of centuries, and today is the proud producer of more than ninety percent of the United States' wines. Indeed, if California was a country, it would be the fourth largest producer of wine in the world, with a vast range of vineyards covering almost half a million acres. The secret to California's success as a wine region has a lot to do with the high quality of its soils, and the fact that it has an extensive Pacific coastline which perfectly tempers the blazing sunshine it experiences all year round. The winds coming off the ocean cool the vines, and the natural valleys and mountainsides which make up most of the state's wine regions make for ideal areas in which to cultivate a variety of high quality grapes. Carignan is an ancient blue-skinned grape varietal, thought to be indigenous to the Aragon region of Spain. However, today it is most commonly associated with the fine wines of southern France, and has been grown in many countries around the world which have the warm and dry conditions it requires to thrive. Carignan is recognized as being quite a sensitive vine, highly susceptible to all kinds of rot and mildew, although producing excellent results when given the right conditions and handled correctly. Its high tannin levels and acidity make the Carignan grapes very astringent, and as such, they are often used as a blending grape to give body to other, lesser bodied varietals. Despite this, with careful treatment, Carignan can produce superb single varietal wines packed full of character and unique attributes.