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Eden Valley covers an area as large as that of the Barossa Valley proper, but is less intensely developed. It is justifiably famous for its Riesling, which vies for supremacy with that of the Clare Valley. This region is also home to such renowned Shiraz vineyards as Henschke's Hill of Grace and Mount Edelstone and the Chardonnay vineyards of Mountadam. High Eden is an officially registered subregion, located at the southern end of the Eden Valley.
Altitude is all-important in determining mesoclimate, although aspect and slope are also important in this hilly terrain. Thus, at an altitude of around 500 metres (1640 feet) the Pewsey Vale, Heggies and High Eden vineyards at the southern end of the Eden Valley are appreciably cooler than the more northerly Henschke vineyards at an elevation of 380 to 400 metres (1247 to 1312 feet) around Keyneton. Overall, of course, growing season temperatures are significantly lower than those of the Barossa Valley, and the final stages of ripening and harvesting take place in much cooler conditions. Wind is a major factor, too, in restricting both growth and yield on the typically exposed hillsides. Water availability is a limiting factor in the expansion of vineyards.
It hardly needs be said that the topography is varied. Rolling, exposed hills with moderately steep gradients are commonplace and the correct match of site and variety is critical. As one might expect, given the varied terrain, there are a number of soil types. The most common range from grey to brown in colour and from loamy sand to clay loams, with subsoils deriving from weathered rock. Ironstone gravels, quartz gravels and rock fragments are present in the surface and subsurface. These are well suited to dry land viticulture but there are also patches of weaker sandy soils on the slopes, underlain by weathered mica-schists, which have reduced water-holding capacity.
Key wine varieties:
Riesling: In common with the Clare Valley, the Eden Valley also has its Riesling tradition. Riesling is the most important white grape (and wine) of the region, initially developing fragrant yet strong lime juice aromas with great intensity of flavour on the palate. As the wines age, marmalade and toasty nuances appear on nose and palate. Good Eden Valley Riesling will take ten years or more to reach its peak.
Cabernet Sauvignon: Site climate is of key importance. The Cabernet Sauvignon produced from vineyards around the Eden Valley village is of the highest quality, with perfectly ripened cassis-accented fruit flavours. These contrast with wine from higher, cooler sites that have more elegant undertones of green leaf and dark berry characters.
Shiraz: Shiraz ranks as the most important red grape and often the most highly regarded wine of the region. Contrary to expectations, the wines rarely show the spicy and peppery characters of cool climate Shiraz from other parts of southern Australia, notably Victoria. Rather, they tend to more luscious plum and blackberry fruit characters, sometimes with touches of liquorice and more gamey, forest characters. Structurally, the wines are very smooth, with ripe tannins that are integrated and well balanced, guaranteeing a long life.
Chardonnay: Chardonnay is a relative newcomer, with the first commercial vineyards in South Australia being established at Mountadam in 1973. The variety has proved to be highly successful and rich complex wines are being produced; their flavours range through a classic array of melon, fig and cashew.
Source: The official Wine Australia website