Mazuelo has its origin, most probably, in Aragón. This is a very vigorous variety and it is also very fruitful, with late budding and very late ripening, so it needs warm climates as Mediterranean ones to thrive. Mazuelo is highly prone to powdery mildew and also likely to suffer botrytis cinerea, downy mildew and grapevine moth. Its clusters hardly become detached from the vine, so it is not suitable for mechanical harvests.
Mazuelo is an extreme variety at every level: it is fruitful, with high acidity, deep colour and bitter taste tannins.
In Spain, Mazuelo variety is known as Cariñena, it is authorised in the appellation La Rioja but, though its acidity can be very positive in blended wines, it is rarely used. Marqués de Murrieta produces a Mazuelo single-variety wine. Other regions that also plant this variety are Aragón (Cariñena), Cataluña, Castilla La Mancha and Navarra. Some of the best Mazuelo single-variety wines are Cims de Porrera, from gobelet pruned Mazuelo vines planted on the slate covered slopes of the Priorat area. Another excellent example is the so-called “Diabolical Trio” Laurent Combier, Jean-Michel Gérin and Peter Fischer.