Zinfandel = Primitivo = Tribidrag - a genetic mystery
For more than a century California regarded Zinfandel as its own, almost national grape - and nobody knew where it actually came from. Meanwhile in Italy a grape with a strikingly similar character grew under the name Primitivo, while on the Croatian coast of Dalmatia a handful of old vines of a local variety were quietly dying out. It took DNA analysis to solve one of the wine world’s greatest mysteries: Zinfandel, Primitivo and Croatian Tribidrag are genetically the same plant, simply under three different names. This is the story of a detective investigation that linked California, Puglia and a small town near Split. Here is the full tale of a grape with three identities.
Three names, one grape
California’s Zinfandel, Italy’s Primitivo from Puglia and Croatia’s Crljenak Kaštelanski (also known as Tribidrag) are three names for one and the same dark-skinned grape variety. Although wines under each of these labels can taste somewhat different, their genetic code is identical. These are not related varieties or cousins, but exactly the same plant, which travelled across countries over the centuries and each time was given a new name. Such a situation is not unique in the wine world, but it is rarely so spectacular. Understanding that we are drinking one grape in three incarnations changes the way we look at these wines and their history.
The mystery that haunted California
Zinfandel reached the United States in the early 19th century and for decades passed as an American speciality, even though no grape is native to North America in the sense of the noble European varieties. The grape’s origin remained a mystery for so long that it earned its own name: the Zinquest, the search for Zinfandel’s roots. Winemakers and scientists suspected a European source, but proof was missing. Already in the 20th century a striking resemblance to Italy’s Primitivo from Puglia had been noticed. There were many hypotheses, and the case was complicated by the fact that old ampelographic records were often ambiguous. Only genetics could settle the dispute once and for all, because the look of leaves and clusters can fool even experts.
The 2001 DNA breakthrough
The decisive breakthrough came in December 2001. Geneticist Carole Meredith of the University of California, Davis, working with Croatian scientists Ivan Pejić and Edi Maletić, used DNA profiling to confirm that California’s Zinfandel, Italy’s Primitivo and Croatia’s Crljenak Kaštelanski are genetically the same variety. Earlier, in the 1990s, Meredith had already proven the identity of Zinfandel and Primitivo. The missing link, however, was the Croatian ancestor, which had to be found in the field. The analysis of genetic markers left no doubt - it is one plant. This discovery showed what a powerful tool genetics is in solving puzzles that traditional ampelography had been unable to close for a whole century.
Tribidrag - Croatian roots and the name
The Croatian ancestor was found by chance in 2001 in the seaside vineyards of Kaštela, a town in Dalmatia just northwest of Split. The matching vine was found in the vineyard of Ivica Radunić in Kaštel Novi. This discovery allowed the grape to be linked to its oldest documented name, Tribidrag, which a Croatian record attests as early as 1444. That makes it a variety with truly deep roots. The word Tribidrag comes from Greek and means early ripening. Interestingly, the Latin primativus, from which the Italian name Primitivo derives, has exactly the same meaning. Two distant names thus describe the same trait: the fast ripening of the fruit on the vine.
How the grape reached Italy and America
From Dalmatia the grape travelled across the Adriatic to Italy’s Puglia, where under the name Primitivo it settled in particular around Manduria and Gioia del Colle. The grape most likely reached the United States in the early 19th century, first on the East Coast as a hothouse and table grape, brought in by plant nurseries. From there, in the days of the Gold Rush, it made its way to California, where it found an ideal climate and became one of the pillars of the local wine industry. Today it grows on a significant share of California’s vineyards. The journey of one plant from the Croatian coast, through sunny Puglia, all the way to the Californian hills is a fine example of how the vine travelled together with people and their migrations.
Plavac Mali and the genetic family
Before Tribidrag was found, suspicion fell on the Croatian grape Plavac Mali, popular in Dalmatia. The trail was right, but inexact. DNA studies showed that Plavac Mali is not identical to Zinfandel, but rather its offspring - a natural crossing of Zinfandel (Tribidrag) with another Dalmatian variety, Dobričić. In other words, Tribidrag is the genetic parent of the famous Plavac Mali. This shows that the variety not only survived the centuries, but also produced important descendants in its region of origin. The Croatian heritage thus turned out to be richer than anyone had supposed - not just a lost ancestor, but the head of a whole local family of grapes.
White Zinfandel - a sweet rescue for old vines
Paradoxically, it was a sweet rosé wine that saved California’s old Zinfandel vines. In the 1970s the Sutter Home winery popularised White Zinfandel, a pale pink, slightly sweet, low-priced wine. It became an enormous commercial hit. Although connoisseurs looked down on it, demand for White Zinfandel made it worthwhile to keep ancient vineyards that might otherwise have been pulled up. Thanks to this, priceless old vines survived, giving today the best red wines from this grape. It is one of those cases where a mass-market, unfashionable product saved a heritage that is now the foundation of prestigious bottles.
Style: jammy, powerful, spicy
Zinfandel is famous for its intense, ripe fruit - blackberries, raspberries, black cherries, often with a jammy sweetness and a note of preserves. This is accompanied by spicy accents of pepper and seasonings and a high alcohol content, often from 14 up to even 17 percent. This comes from the high accumulation of sugar in the ripe fruit. A characteristic trait of the grape is the uneven ripening of its clusters: on one bunch you can find green, ripe and already raisined berries at the same time. This makes harvesting difficult and gives the wines complexity, but also the risk of overripeness. The best Zinfandels balance this power with freshness and structure, avoiding the impression of heavy, over-sweet marmalade in the glass.
Primitivo versus Zinfandel - differences in the glass
If it is the same grape, why do the wines taste different? Terroir, climate and winemaking tradition decide. Italian Primitivo from Puglia tends to be somewhat more restrained, with clearer structure, earthiness and tannin, often at moderate strength. California Zinfandel usually heads toward lush, jammy fruit and higher alcohol, with a bold, sunny character. This shows how much wine style depends not only on the genes of the plant, but also on the place and the hand of the winemaker. The same genetic code gives two different faces, depending on whether the vine grows under the sun of Puglia or on the hills of California. It is worth trying both side by side.
Old vines and the field blend
The treasure of California Zinfandel is its old vineyards, often a century old, trained as low, free-standing bush vines without wires (head-trained). Such aged plants give small yields, but fruit of enormous concentration. Many historic vineyards are so-called field blends - mixtures of different grapes planted together in the past, growing side by side and harvested at once, in which Zinfandel plays first fiddle but is accompanied by other varieties. Regions like Lodi, Sonoma and the Sierra Foothills are famous for such vineyards. They are living museums of winemaking, and the wines from them can have depth and character unattainable for young plantings. Old vines are real value, not just a marketing slogan.
The key points in a nutshell
Zinfandel, Primitivo and Tribidrag are genetically one grape with three names, confirmed by the 2001 DNA analysis by Carole Meredith and Croatian scientists. The oldest name, Tribidrag, dates back to a Croatian record from 1444 and means early ripening - just like the Italian Primitivo. The Croatian ancestor was the parent of the famous Plavac Mali. In the glass Zinfandel is a powerful, jammy, spicy wine, while Primitivo tends to be more restrained and structured, despite the identical genes. The old Californian vines give the best bottles. If you want to consciously compare Primitivo with Zinfandel and record your own impressions, keep tasting notes in the GustoNote app. See also our posts on Cabernet Sauvignon and Grenache.