A fossilized leaf imprint found near Eisleben, Germany, may be 56 million years old, doubling the previously accepted timeline for the Cannabis genus and raising new questions about where the plant actually came from. Researchers say further investigation is underway. The implications are enormous either way.
It had been sitting in a museum drawer for nearly 140 years.
First described in 1883 by the scientist Paul Friedrich as Cannabis oligocaenica, a fossilized leaf imprint in the collection of Berlin’s Museum für Naturkunde had not been analyzed in detail until now. When researchers recently took a closer look, they realized they might be sitting on one of the most significant botanical discoveries in recent memory.
The fossil, a leaf impression in fossilized mud found near Eisleben in Germany’s Saxony-Anhalt region, has been dated to the Lower Eocene, approximately 56 to 48 million years ago. If the identification holds up, it would make this specimen by far the oldest known cannabis fossil ever found, doubling the previously accepted timeline for the entire Cannabis genus and raising fundamental questions about where the plant actually originated.
The museum is careful about the framing. “Further investigations are now underway to determine whether this is indeed by far the oldest known specimen of the Cannabis genus,” the institution said in an April 17, 2026 press release. This is a preliminary finding, not a confirmed classification. But the early evidence is striking enough that scientists are taking it very seriously.
What makes this fossil significant
Until now, the oldest known cannabis evidence came from two sources. Pollen samples from the Miocene epoch dated cannabis to roughly 20 million years ago. Molecular dating of genetic material from living cannabis plants suggested the genus could be as much as 28 million years old. Both figures pointed to an origin in northwest China and the broader Central Asian region, the so-called Tibetan Plateau origin theory that has dominated cannabis botanical research for decades.
The German fossil challenges both the timeline and the geography.
How this fossil changes the timeline
20M years
Oldest known cannabis pollen samples, from the Miocene epoch, found in Central Asia
28M years
Estimated age of the Cannabis genus based on molecular dating of modern plant DNA
56M years
Estimated age of the Berlin fossil, found in Germany — potentially doubling the entire known timeline
Note: The 56 million year identification is preliminary. Further investigation is underway at Museum für Naturkunde Berlin.
The leaf that looks almost identical to modern cannabis
The morphological resemblance between the fossil and modern cannabis plants is what caught researchers’ attention. Ludwig Luthardt at the Museum für Naturkunde Berlin told IFLScience that the similarities were immediately striking.
“The morphological similarities with modern-day cannabis leaves is striking. Not only the overall morphology or outlines of the leaves is nearly identical but also the leaf venation pattern.”
Ludwig Luthardt, Museum für Naturkunde Berlin
The imprint, with its serrated, lanceolate leaves, bears a remarkable resemblance to the cannabis plant as it exists today. That visual similarity is what makes the case compelling. But it is also where the limits of the evidence become clear.
The fossil is missing the microscopic structures that would allow for definitive classification. Specifically, the trichomes — the fine hair-like structures on modern cannabis leaves that contain THC — are not preserved in the imprint. Without them, researchers cannot confirm with certainty that this specimen belongs to the Cannabis genus rather than a related species within the Cannabaceae family, which also includes hops.
“We cannot exclude that these were originally present, but leaf epidermal structures are missing in the fossil.”
Ludwig Luthardt, Museum für Naturkunde Berlin
Whether the ancient plant produced any psychoactive compounds is, of course, impossible to know. As the museum noted in its press release: “Whether the fauna of the Eocene experienced any intoxicating moments is, of course, not recorded.”
Where did cannabis actually come from?
The geographic implications may be as significant as the timeline. Finding a potential cannabis fossil in Germany’s Saxony-Anhalt region — not Central Asia, not the Tibetan Plateau, not northwest China — directly challenges the accepted origin story of the plant.
“The origin of Cannabis sativa and Cannabis indica was supposed to be in the Himalaya montane regions, where open habitats were favouring the radiation of herbaceous plants. Probably, our specimen was a different species, but the origin of the genus might be now seen somewhere else.”
Ludwig Luthardt, Museum für Naturkunde Berlin
Luthardt went further, suggesting the plant’s story may be even older and more geographically widespread than the Eocene fossil implies. The Cannabaceae family has existed since the Cretaceous period, approximately 90 million years ago. That opens the possibility of even older cannabis ancestors waiting to be discovered in fossil localities that have not yet been systematically explored.
“Fossil localities are hardly accessible and the research focus on the floras of this age is low.”
Ludwig Luthardt, Museum für Naturkunde Berlin
Translation: there are almost certainly older cannabis-related fossils still waiting in the Himalayas, Nepal and across Central Asia, in localities that researchers have not yet systematically examined. The Berlin fossil may not be the oldest cannabis ancestor ever. It may simply be the oldest one found so far.
What this means for everything we thought we knew
If the identification is confirmed through further investigation, the implications extend well beyond botany. The accepted story of cannabis (that it evolved in Central Asia, that it was discovered and cultivated by humans in that region, that its history as a plant begins in a relatively narrow geographic and temporal window) would need to be fundamentally revised.
The plant’s natural range, its evolutionary adaptations, its relationship with climate and soil across geological epochs, and even the question of when and where ancient humans first encountered it would all become open questions again.
A plant that has been at the center of human culture, medicine, commerce and policy for thousands of years may turn out to have been part of the Earth’s botanical landscape for tens of millions of years before a single human being ever laid eyes on it.
What the German fossil makes clear, regardless of final classification, is that cannabis has a history far deeper and far more widespread than the existing evidence has captured. Further investigation is underway at the Museum für Naturkunde Berlin.
The plant, as always, has more to tell us.
Sources: Museum für Naturkunde Berlin, press release, April 17, 2026; IFLScience. Photos: Ludwig Luthardt/Museum für Naturkunde Berlin, via museum press release.
