Portugal is home to hundreds of ancient olive trees, one may be over 3,700 years old

Portugal’s Ancient Olive Groves: Trees Older Than Most Civilizations

Usagevpn.com – While German botanists recently confirmed a tree at roughly 1,100 years old as the oldest known specimen in their country, the Iberian Peninsula hosts a far more extraordinary botanical heritage. Across Portugal, hundreds of olive trees have been formally certified at ages surpassing two millennia, with at least one individual estimated to exceed 3,700 years — making it older than the Roman Empire itself. These living monuments, scattered from the Alentejo plains to the northern coast, represent one of Europe’s most concentrated collections of ancient woody organisms.

The Oliveira do Mouchão: A Survivor of Millennia

For years, the title of Portugal’s oldest olive tree belonged to a specimen known as the “Oliveira do Mouchão,” situated in the municipality of Abrantes. In October 2018, the University of Trás-os-Montes and Alto Douro (UTAD) confirmed the tree was already 3,350 years old at that point. The institution described it as

“a contemporary of the Phoenicians, Celtiberians and Romans”

and noted that by early 2022 it was still

“producing olives as if in the flower of youth, despite a trunk gnawed away by the ravages of time.”

The tree endured what UTAD characterized as the passage of “invading peoples, barbarians and displaced peoples” across thousands of years, attributing its survival to the depth of its root system. It also entered the 2022 European Tree of the Year competition, placing fifth in the Portuguese national round and thus falling short of representing the country at the continental level.

A Patented Method for Dating Ancient Trunks

The age determinations behind these certifications rest on a mathematical model developed by a UTAD research team. The approach correlates a tree’s chronological age with measurable trunk parameters — diameter, height, and circumference — and has since been patented. UTAD applies the technique in partnership with the company Oliveiras Milenares, a collaboration that dates to 2007. The methodology has enabled dating of countless specimens both domestically and internationally.

Details of the underlying science have been published through the Florestas.pt portal, an initiative of Navigator Company and Raiz – Forest and Paper Research Institute, which disseminates information on Portuguese forestry and arboriculture.

Oliveira do Peso: Pushing Past 3,700 Years

By the time the Abrantes discovery gained wider attention, UTAD had already certified numerous other millennial olive trees across the country. One notable example sits in Santa Iria de Azóia, within the municipality of Loures, where analysis placed the specimen at approximately 2,850 years old.

However, an even older individual has since been identified in the Alentejo region. Located on the Herdade do Peso estate in Vidigueira, Beja district, the tree known as the “Oliveira do Peso” was assessed in 2021 at more than 3,700 years old — making it the oldest certified olive in Portugal and potentially one of the oldest known olive trees anywhere in Europe.

The Oliveira do Peso also competed in the Portuguese Tree of the Year contest for 2024, finishing third in the national selection. Its candidacy was framed around the “heritage significance” of what the estate describes as “the oldest millennial olive tree on the Herdade do Peso estate.” The surrounding plain hosts a grove whose combined ages, by the estate’s own accounting, surpass 7,000 years.

A National and International Network of Ancient Specimens

Beyond the two headline trees, UTAD highlights additional millennial olives in Monsaraz (Évora district), where several ancient specimens exist, one at roughly 2,450 years. Further certified trees are scattered across Estremoz, Montemor-o-Novo, Lagoa, Beja, Vilamoura, Évora, and Serralves Park in Porto.

The university’s dating work has also extended beyond national borders. Invitations have come from Spain and France, with assessments carried out in Bordeaux, Girona, Málaga, and on the Balearic island of Menorca, where UTAD certified a specimen exceeding 2,300 years old.

Why Olives Outlive Empires

The extraordinary longevity of these trees is not merely a matter of slow growth. José Luís Louzada, the UTAD researcher who developed the scientific framework underpinning the dating protocol, explains the biological mechanism in a statement published on the university’s website:

“Without doubt one of the living beings that best withstand the passage of time, thanks to its strong capacity for rejuvenation.”

He elaborates that

“a piece of trunk, no matter how old it is, has the capacity to sprout again,”

allowing the organism to continue producing fruit indefinitely. Louzada attributes this resilience, among other factors, to the species’ exceptional regenerative biology — a trait that distinguishes olive from most other long-lived woody plants and explains why specimens can persist through centuries of climate fluctuation, agricultural change, and human conflict without ceasing to bear olives.

The practical implication for Portuguese heritage management is significant. With hundreds of certified millennial trees distributed across multiple districts, the country possesses a living botanical archive of unparalleled depth. Each trunk encodes millennia of ecological and cultural history, from pre-Roman settlement patterns to medieval agronomy, and their continued survival depends on ongoing monitoring, protection from disease, and the institutional capacity to document and defend them as cultural patrimony.