The white grape variety is an open-pollinated seedling of Cabernet Sauvignon. The name means "white swan". The vine was discovered in 1989 by the wife of Australian winemaker Dorham Mann in her garden in the Western Australian community of Baskerville (in the eponymous Swan Valley). The garden is close to a vineyard planted with Cabernet Sauvignon, so the vine was probably the result of selfing. It is a distinct variety that was also officially registered in 1997. It is cultivated as a wine grape in the Mount Benson area on the Limestone Coast in South Australia. However, no stock was recorded in 2016 (Kym Anderson).