The red grape variety (also Caladok, Kaladok) is a new cross between Grenache Noir (Garnacha Tinta) x Malbec (Cot), which was confirmed by DNA analyses carried out in 2013. The cross was made in 1958 by the French grower Paul Truel (1924-2014) on behalf of INRAE at the Domaine de Vassal.

The medium to late ripening vine is resistant to coulure (this was the primary breeding goal) and botrytis (grey rot), as well as being less susceptible to powdery mildew. It produces colourful, tannin- and alcohol-rich red wines with ageing potential, but is also used for the production of fruity rosé wines.
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