Ben Dronkers: the sailor who turned a seed collection into a cannabis empire
Some cannabis pioneers built their legacy around a single invention or a single shop. Ben Dronkers built his around a habit that started almost by accident: collecting seeds on long voyages. He did this decades before he had any plan to turn that hobby into one of the most influential seed companies in the world.
A merchant seaman's side project
Ben Dronkers was born in 1949 in Rotterdam, and in 1963 became a merchant seaman with the Holland America Line 1. His work took him to numerous countries, and along the way he started collecting cannabis seeds, particularly high-yielding varieties sourced from farmers in Pakistan and other parts of Asia 1. What began as personal curiosity slowly became an extensive, genuinely valuable genetic collection, the kind of resource that doesn't exist by accident, it takes years of deliberate, patient gathering 2.
By the 1980s, Dronkers was one of the early Dutch advocates for growing cannabis domestically for personal use, an idea championed early on by Wernard Bruining, another key figure in this same era of Dutch cannabis history 3. That advocacy came with real legal risk. Large-scale commercial cultivation in the Netherlands at the time was still technically illegal even under the country's tolerance policy, and Dronkers was arrested repeatedly for it before eventually shifting his focus toward seed production instead of cultivation itself 3.
Founding Sensi Seeds
In 1985, that shift became Sensi Seeds, now widely recognized as the world's oldest cannabis seed company still in operation 4. In 1991, Dronkers merged his collection with that of another breeder who had been working with American hybrid genetics since the 1980s, combining both gene pools into what became the modern Sensi Seed Bank 5. Over the following decades, Sensi Seeds grew into one of the largest cannabis seed producers in the world, with a catalog that traces its roots directly back to Dronkers' early seafaring seed-collecting habit 4.
The world's first cannabis museum
Also in 1985, alongside his friend, cannabis author and activist Ed Rosenthal, Dronkers opened the Hash Info Museum in Amsterdam, the first museum in the world dedicated exclusively to cannabis 6. Its opening did not go entirely smoothly: it was ordered closed by the Dutch Minister of Justice just one day after opening 6. Dronkers pushed back, and the museum reopened about a week later under a new name, the Hash Marihuana & Hemp Museum, the name it still carries today 6. In 2008 it expanded with an additional Museum Gallery annex, and in 2012 a sister museum opened in Barcelona, housed in a sixteenth-century palace in the city's Gothic Quarter 7.
Building the industrial side of the plant
Dronkers didn't limit his focus to recreational cannabis. In 1994, he founded HempFlax, a company dedicated to reviving the Netherlands' industrial hemp industry for fiber and textile applications, an investment of tens of millions of euros over the years that followed 8. HempFlax grew into one of Europe's largest hemp processors, and today ranks among the continent's leading CBD oil producers 2. It's a part of his legacy that gets less attention than the seed bank or the museum, but it reflects the same underlying instinct: treating cannabis as a serious, multi-purpose crop worth long-term industrial investment, not just a recreational product.
Recognition and legacy
In 2013, Dronkers was inducted into High Times' Counterculture Hall of Fame during the Cannabis Cup in Amsterdam, an honor reserved for figures considered foundational to cannabis culture 5. Sensi Seeds marked its 40th anniversary in 2025, and the company has continued to evolve, including a 2025-2026 genetics partnership with Death Row Records that brought Sensi-bred strains to the European and then American markets 9. Dronkers has since passed leadership of his businesses on to his children, but the foundation, an entire seed bank, two museums, and a hemp company, remains his 2.
The bottom line
Ben Dronkers' path from merchant seaman to cannabis industrialist is a reminder that some of the most consequential industry infrastructure starts as a personal fascination pursued patiently over decades, not a business plan drafted in a boardroom. Between the seed bank, the museums, and the hemp company, his fingerprints are on nearly every commercial layer of how cannabis genetics, culture, and industrial use developed in the Netherlands.
Sources
Newsweed, Ben Dronkers: Founder of Sensi Seeds and Cannabis Legend
Mr. Hanf, Ben Dronkers: cannabis pioneer and founder of Sensi Seeds
Sensi Seeds, Sensi Seeds' Pivotal Moments: Setting Up an International Knowledge Base
Beard Bros Pharms, Breeding the Culture: Ben Dronkers and Sensi Seeds
PR Newswire, Legendary Cannabis Genetics Meet Hip-Hop Royalty: Sensi Seeds x Death Row Records
