Cabernet Sauvignon is one of the world's most widely recognized red wine grape varieties. It is grown in nearly every major wine producing country among a diverse spectrum of climates from Canada's Okanagan Valley to Lebanon's Beqaa Valley. Cabernet Sauvignon became internationally recognized first through its prominence in Bordeaux wines where it is often blended with Merlot and Cabernet franc. From France, the grape spread across Europe and to the New World where it found new homes in places like California's Napa Valley, Australia's Coonawarra region and Chile's Maipo Valley. For most of the 20th century, it was the world's most widely planted premium red wine grape until it was surpassed by Merlot in the 1990s.
In the 1970s, the Coonawarra region first brought international attention to Australian Cabernet Sauvignons with intense fruit flavors and subtle minty notes. The Margaret River region soon followed with wines that were tightly structured with pronounced black fruit notes. In the 1980s, Australia followed California's contemporary trend in producing lighter, more "food friendly" wines with alcohol levels around 11-12% percent. By the early 1990s, the styles changed again to focus on balance and riper fruit flavors. Today Cabernet Sauvignon is the second most widely planted red wine grape in Australia, following Shiraz which it is often blended with. It can be found in several wine regions with many large producers using grapes from several states. Notable regional differences characterize Australian Cabernet Sauvignon: in addition to the wine styles of Coonawarra and Margaret River, the Barossa Valley produces big, full bodied wines while the nearby McLaren Vale produces wines with more concentrated fruit, and wines of the Victorian wine region of the Yarra Valley are noted for their balance in acidity, tannins and fruit flavors.
The style of Cabernet Sauvignon is strongly influenced by the ripeness of the grapes at harvest. When more on the unripe side, the grapes will exhibit pronounced green bell peppers and vegetal flavors. When harvested overripe the wines can taste jammy and may have aromas of stewed black currants. Some winemakers choose to harvest their grapes at different ripeness levels in order to incorporate these different elements and potentially add some layer of complexity to the wine. When Cabernet Sauvignon is young, the wines typically exhibit strong fruit flavors of black cherries and plum. The aroma of black currants is one of the most distinctive and characteristic element of Cabernet Sauvignon that is present in virtually every style of the wine across the globe. Styles from various regions and producers may also have aromas of eucalyptus, mint and tobacco. As the wines age they can sometimes develop aromas associated with cedar, cigar boxes and pencil shavings. In general New World examples have more pronounced fruity notes while Old World wines can be more austere with heighten earthy notes. (Adapted from Wikipedia)