The roots of the blue wine grape Primitivo lie in Italy, in the far south of Italy to be precise. The grape variety is mainly grown in the 'heel of the boot', Puglia. That's where this red wine grape is at its best. But although Primitivo can often be found in the south of Italy, it is by no means the only place where the wine grape grows. DNA research has shown that the Primitivo grape is genetically similar to the American Zinfandel, which is widely planted in California. The grape is also genetically similar to the Tribidrag grape, which can be found in Croatia.