There’s a theory that the best wines are made on the extreme boundaries of a growing region. Push the limits of where a certain variety can ripen, and you’ll make the best wine – the Mourvèdre grown by Beaucastel at the northern edge of the southern Rhône for example, or Cabernet Sauvignon grown on California’s Santa Cruz or Dunn mountains. South Africa's Constantia Glen winery is going to put that theory to the test.
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