The white grape variety is a openly bloomedseedling of Cabernet Sauvignon, The name means "white swan". The vine was discovered in 1989 by the wife of the Australian winemaker Dorham Mann in her garden in the West Australian community of Baskerville (in the eponymous Swan Valley). The garden is near a vineyard planted with Cabernet Sauvignon, so the vine is probably the result of one selfing was. It is an independent variety that was officially registered in 1997. It is cultivated in the Mount Benson area on the Limestone Coast in South Australia as a wine grape. In 2010, however, no stock was shown (Kym Anderson ).