Life Style / Wine Grapes / Calzin: Variety developed in 1937 and released in 1958 by H.P. Olmo of U.Davis, California. Is the result of a Zinfandel x Refosco cross. Reported to have been developed as a red spider-mite resistant cultivar, but lacked popular acceptance because of high tannin content. Trial plantings showed it would produce a red wine somewhat similar to the former parent but naturally required longer ageing.
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