The white grape variety (also Davis S15-58) is a new variety between Muscat d'Alexandrie x Grenache Gris(Garnacha Roja). The crossing was made in 1940 by the botanist Dr. Harold Olmo (1909-2006) at the University of California in the USA. The medium maturing, high-yielding vine is susceptible to botrytis. It produces white wines with a light muscatel. The variety is grown in California mainly in the Central Valley and Sonoma County and is used for white and sparkling wines. In 2010, 324 hectares of land were designated for cultivation (Kym Anderson). A small population is also said to exist in Hawaii.
Pictures: UCDAVIS - Foundation Plant Services