Perhaps you recall Tollana which promoted its Eden Valley wines for a decade or so around the 1980s to finally give up in the 1990s. In my retail shop days, I developed the view that explaining new wines to customers with tastings and good prices would influence them to try wines from less known districts, regions, or countries. Two districts that I failed with were Eden Valley and Langhorne Creek and so it was that Tollana was absorbed into the giant Southcorp group and a wonderful range of Eden Valley wines disappeared.
The vineyards still exist, and the fruit becomes part of large company brands. Over the last decade adventurous single-family operators have been attracted by these now mature Eden Valley vineyards. While hardly a revival, with patience and the maturing of consumers palates we must hope they succeed.
When they make more than they can sell they may offer wine to Glug which is the origin of this excellent Eden Valley Shiraz.