Heinrich Himmler’s weakness for pseudoscience and natural medicine: The ‘LEOPARD LILY PROJECT’

The Nazi’s sterilisation programme aimed at preventing Germans from reproducing who were deemed to be of inferior genetic make-up. It is well-known, and dozens of books have been published about it. In contrast, the ‘LEOPARD LILY PROJECT’ has been almost forgotten. Even though it also was about sterilising large groups of people, it had a very different overall aim.

The porject can be traced back to an Austrian dermatologist named Dr. Adolf Pokorny. Pokorny had encountered a scientific paper detailing animal experiment involving Dieffenbachia seguine (commonly known as the Leopard Lily or “dumb cane”). The juice of this tropical plant could be administered secretly to nonconsenting victims and was assumed to cause permanent sterility without affecting the capacity to work.

Pokorny recognized the dark potential of this botanical property. In his letter to Himmler, he explicitly proposed using Leopard Lily to secretly sterilize “three million Bolsheviks” and other populations in Eastern Europe. Pokorny’s vision was calculated and ruthless: by rendering the inhabitants of occupied territories infertile, the Third Reich could exploit them as slave labour for a single generation. Once that generation aged and died, the population would naturally become extinct, leaving the land cleared for German colonization.

The primary reason this unproven botanical theory was taken seriously at the highest levels of the Nazi command rests on the unique obsessions of Heinrich Himmler. The SS leader was deeply fascinated by alternative medicine, occultism, and pseudoscience. He harboured an intense distrust of mainstream academic medicine and actively promoted natural, herbal remedies.

Captivated by Pokorny’s letter, Himmler bypassed conventional, rigorous scientific channels, assigning high-ranking SS bureaucrats and doctors to fast-track the cultivation of the plant and initiate medical experimentation. However, to operationalize the project, the SS faced an immediate bottleneck: Leopard Lily is native to tropical climates, and Himmler did not possess enough of the plant to extract toxins at a mass scale. Huge, specialized greenhouses were commissioned, and efforts were made to cultivate the plant under controlled conditions within Germany. Yet, the project collapsed under the weight of its own scientific flaws and the changing tides of World War II. The plant could not be grown in quantities large enough to fulfil Himmler’s genocidal dream.

Following the collapse of the Third Reich, the details of the project were brought to light during the Nuremberg Doctors’ Trial (1946–1947). Dr. Adolf Pokorny was placed in the dock alongside prominent Nazi medical war criminals. Pokorny was one of the few to be acquitted by the tribunal. What then became of him remains a mystery.

The very last paragraph of my new book reads as follows: “The story of the Leopard Lily project can serve as a reminder of the dangers caused by unholy alliances of pseudoscience, ideology, immorality, and political power. These dangers have not ended with the Third Reich. If the book can contribute to reducing the risks of future recurrences, it was worth the effort of writing it.”