There is an olive tree in Calabria that produces white fruit. Not green, not purple, not black — white. Ivory white, even at full maturity, when every other olive variety in the world has long since turned dark. This tree is called the Leucolea, or Oliva Bianca. It is found almost nowhere else on earth. And for centuries, the oil it produced was considered sacred.
This is the story of the rarest olive in Calabria, the oil that gave the Catholic Church one of its most important sacraments, and why this ancient cultivar nearly disappeared entirely — and is only now finding its way back.
What Is Leucolea?
Leucolea, also known by its scientific name Olea europaea var. leucocarpa, is an ancient olive cultivar whose defining characteristic is immediately visible: its fruit stays ivory white at full maturity. Every other olive variety in the world changes color as it ripens, moving from green through purple to black as the fruit produces anthocyanins, the pigments responsible for dark coloration. In Leucolea, that pigmentation process simply does not happen. The anthocyanin synthesis is interrupted, and the olives remain pale white — luminous, almost translucent — on the branch.
The name makes this plain. Leucolea comes from the Greek words for white and olive. It is also known as Leucocarpa (white fruit), Olivo della Madonna, and Olivo del Crisma. Each name points to the same extraordinary characteristic: this olive does not look like any other olive in the world.
The tree itself is moderately vigorous with an upright growth habit, a wide and spreading canopy, and dark green leaves of medium-to-large size. The fruit is oval with dense, fleshy pulp. Unlike most varieties, Leucolea olives can remain on the branch long past their normal harvest window — sometimes through the winter and into early spring — without dropping. Even when cured in brine or packed in salt, the olives retain their white color. Their flavor, however, is virtually absent. Leucolea olives are essentially tasteless, and the oil they produce, while extraordinarily clear and pale, is not particularly interesting from a culinary standpoint. This cultivar was never grown for the table or for cooking. It was grown for something else entirely.
Where Does Leucolea Come From?
The origins of Leucolea are believed to trace back to the Greek island of Kasos, in the Dodecanese. Researchers believe the earliest specimens were brought to Calabria from Kasos, likely during the period of Magna Graecia, when Greek colonizers settled extensively along the coasts of what is now southern Italy. At that time, the Ionian coast of Calabria was deeply Greek in culture, language, and agricultural practice — and the Leucolea arrived with the settlers who planted it.
During the period of Magna Graecia, Leucolea was widespread across Calabria. It was cultivated specifically for its oil, which had properties that made it uniquely suited to religious and ceremonial use. Over time, as the Greek settlements gave way to Roman and later Byzantine influence, the cultivation of Leucolea became increasingly tied to the monasteries and religious communities that shaped Calabrian life through the early medieval period.
The Olio del Crisma: Sacred Oil of the Catholic Church
The oil produced from Leucolea olives is exceptionally pale — nearly colorless, almost water-clear. This clarity is what made it so valuable in a religious context. In the ancient world, a clear-burning oil that produced almost no smoke when used in lamps was extraordinarily rare and prized. Leucolea oil burns clean. In sacred spaces where smoke would stain walls, cloud frescoes, or obscure the atmosphere of ritual, this mattered deeply.
But the most significant use of Leucolea oil was not as lamp fuel. It was as the olio del crisma — the oil of chrism — the sacred anointing oil of the Catholic Church.
Chrism oil is one of the three holy oils used in Catholic sacraments. It is consecrated by bishops and used in baptism, confirmation, holy orders, and the anointing of the sick. The word "chrism" shares its root with "Christ" — both derive from the Greek word for "anointed one." The ritual of anointing with oil is one of the oldest in the Christian tradition, tracing back through Judaism and further still into the ancient world. In the Byzantine Empire, Leucolea oil was used to anoint those designated to the highest imperial offices and in the ceremonies for the coronation of emperors. The Church inherited and formalized this practice, and Leucolea, with its uniquely clear and pure oil, became the cultivar associated with it in Calabria.
The Italian word for the Catholic sacrament of Confirmation — Cresima — is itself derived directly from crisma, from the oil used in the ceremony. The linguistic trace of Leucolea runs through one of the seven sacraments of the Catholic Church.
The Basilian Monks and the Preservation of Leucolea
The people most responsible for keeping Leucolea alive through the medieval period were the Basilian monks — followers of the Rule of Saint Basil the Great — who established monasteries throughout Calabria between the 7th and 10th centuries. The Basilian monastic tradition was deeply rooted in the Byzantine Greek culture that shaped southern Calabria during this period, and the monks brought with them not only their liturgical practices but their agricultural knowledge.
Leucolea was central to that knowledge. The monks cultivated these trees specifically because the oil was required for religious ceremonies. They understood its properties, they maintained the trees with care, and they produced the oil that supplied the sacraments. The presence of Leucolea trees in Calabria today is almost entirely traceable to these monastic communities. Ancient specimens have been found in the provinces of Cosenza and Reggio Calabria, almost always on land that once belonged to Basilian monasteries. In Saracena, in the province of Cosenza, two centuries-old trees were discovered in the garden of a former Capuchin convent.
When the monasteries eventually declined and the religious demand for the oil faded, the reason to cultivate Leucolea disappeared with them. The trees were not profitable as food. The oil was not particularly good for cooking. Without the monks to tend them, the groves were abandoned, and over centuries, the trees were lost one by one.
Near Extinction and Rediscovery
By the 20th century, Leucolea had essentially vanished from Calabrian agriculture. It survived only in isolated specimens — a tree here, a tree there, growing wild or overlooked at the edges of land that had once been monastic. Most of the surviving trees were found in the provinces of Cosenza and Reggio Calabria, and even those had been unrecognized for what they were for generations.
In the 1980s, agronomists and olive researchers began identifying and documenting surviving specimens. Four of the original trees found were saved and propagated through grafting, bringing new plants from the ancient rootstock. The work was slow. Leucolea is notoriously difficult to propagate from cuttings, making the grafting process more technically demanding than with most cultivars. But the effort continued, and today a small number of specialized nurseries in Italy are producing Leucolea plants for replanting.
In recent years, Leucolea trees have been deliberately planted near churches across Calabria as a gesture of cultural and historical preservation. The city of Paola, in the province of Cosenza, was designated the Città dell'Olivo Bianco — City of the White Olive — in 2021, with more than 400 Leucolea trees planted in the area. The Consorzio Olio di Calabria IGP has taken an active interest in protecting and promoting the cultivar as part of Calabria's agricultural heritage.
Leucolea is still rare. It is not yet used in commercial olive oil production in any meaningful volume. The oil it produces, while historically significant, is not culinarily exceptional, and the agronomic challenges of growing and propagating the tree make large-scale cultivation unlikely in the near term. But it is no longer in danger of disappearing entirely. The white olive of Calabria is coming back.
Leucolea as a Sentinel Tree
Beyond its historical and religious significance, Leucolea had one practical agricultural use that made it valuable to Calabrian olive growers: it was used as a sentinel tree for detecting the olive fruit fly, Bactrocera oleae, one of the most destructive pests in Mediterranean olive cultivation.
Because Leucolea olives are white, the earliest signs of fruit fly infestation — which appear as dark entry marks on the skin of the olive — are dramatically more visible on Leucolea fruit than on any other variety. Growers planted a Leucolea tree or two at the edge of their groves as an early warning system. When the white olives showed damage, the growers knew the flies had arrived and could take action before the infestation spread to the rest of the harvest.
It is a small detail, but it is characteristic of how deeply embedded Leucolea was in traditional Calabrian agricultural practice — not as a primary crop, but as a tree with specific, irreplaceable utility.
Why This Matters for Calabrian Olive Oil
Leucolea is not an oil you will find in a bottle on a shelf. Its significance is historical, cultural, and botanical rather than commercial. But the story of this cultivar is inseparable from the story of olive growing in Calabria.
Calabria is the region with the highest plant biodiversity in Italy and among the highest in all of Europe. Its olive cultivars — from the widely planted Carolea to the nearly vanished Leucolea — represent thousands of years of agricultural history, religious practice, and human connection to land. That history does not disappear when a cultivar falls out of commercial use. It waits, sometimes in a single ancient tree at the edge of a former monastery garden, for someone to recognize what it is.
At EXAU, we produce our olive oil from groves on the Ionian coast of Calabria that have been in Giuseppe's family since 1927. We farm regeneratively, we work with olive agronomists, and we think about the long history of this land with every harvest. The Leucolea is part of that history — a reminder that olive growing in Calabria has always been about more than oil. It has been about preservation, continuity, and the particular relationship between a place and the people who tend it.
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Frequently Asked Questions
What is Leucolea?
Leucolea, also known as Oliva Bianca or Leucocarpa, is an ancient and extremely rare olive cultivar found almost exclusively in Calabria, Italy. It is the only known olive variety whose fruit remains ivory white at full maturity rather than turning dark. It is historically significant as the source of the olio del crisma, the sacred chrism oil used in Catholic sacraments.
Why are Leucolea olives white?
During the normal ripening process, olives produce anthocyanins, the pigments that turn fruit dark. In Leucolea, this pigmentation process is interrupted, so the anthocyanins are never synthesized. The olives remain ivory white even at full maturity.
What is the olio del crisma?
The olio del crisma — oil of chrism — is the sacred anointing oil used in Catholic sacraments including baptism, confirmation, holy orders, and the anointing of the sick. Historically in Calabria, this oil was produced from the Leucolea olive, whose pale, clear oil was considered uniquely suited to sacred use. The Italian word for the sacrament of Confirmation, Cresima, derives directly from crisma.
Where does Leucolea grow?
Leucolea survives almost exclusively in Calabria, primarily in the provinces of Cosenza and Reggio Calabria, mostly near land that once belonged to Basilian monasteries. It is now being slowly reintroduced through specialized nurseries and replanting efforts, particularly in and around the city of Paola, which has been designated the Città dell'Olivo Bianco.
Can you buy Leucolea olive oil?
Not commercially. The cultivar is too rare and the oil too limited in volume for commercial production. Leucolea's significance is historical and cultural rather than culinary — the oil it produces is exceptionally clear but not particularly flavorful compared to high-quality extra virgin olive oils from other cultivars.
Why did Leucolea nearly go extinct?
Leucolea was cultivated primarily by Basilian monks for its use in religious ceremonies. When the monasteries declined and the religious demand for the oil faded, the agricultural reason to grow Leucolea disappeared. Without ongoing cultivation, the trees were abandoned over centuries and nearly lost entirely. Rediscovery efforts in the 1980s saved the cultivar from extinction.
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