Slovenian wine is predominantly white and orange. This is not because of the terroir however. Most Slovenian vineyards are small, family owned operations. They don't have the finances and resources of the large Italian and French houses. White/orange wines can be sold young (they age wonderfully by the way), so generate income for the farms on an annual basis. Red wines of course need ageing so can be tough to manage on tight budgets. When you get them though, my word. These are the real hidden gems of Slovenian wines, and Goriška Brda's terroir in particular is perfect for red wine varieties.