Sensi Seeds
An Amsterdam seed company whose founder reportedly found his loophole in a jail cell, with a famous castle and a founding year nobody quite agrees on.
- 42cup results
- 21first places
- 1993–2025active in results
- 6cups entered
01Beginnings
Sensi Seeds, also known as Sensi Seed Bank, is an Amsterdam-based Dutch firm that sells cannabis seeds1. It was founded by Ben Dronkers, the man who also set up Amsterdam's Hash, Marihuana & Hemp Museum1. Even the founding year is a little fuzzy. Wikipedia gives either 1985 or 1998, while the Leaf Nation profile settles on 1985 and describes Dronkers as a Dutch grower and businessman12. Born on 25 December 1949, he grew up in Rotterdam, where gardening with his mother is said to have sparked an early interest in plants2.
Seeds were not his first venture. In 1983 he opened Sensi Smile in Rotterdam, which the article calls the city's first cannabis cafe; it began as a clothing shop with a large pot leaf displayed in the window2. The story of his switch to seeds is a good one, though it rests on that single article. While in jail, Dronkers reportedly studied Dutch drug law, learned that seeds were not covered by the prohibition, checked with his lawyer, and changed what he sold2. In 1985 he and his son Alan took a corner shop in Amsterdam's Red Light District and started selling seeds there, a success from the start by the article's account2.
02The Story So Far
Before the shop, there was the soil. Leaf Nation says Dronkers was growing in makeshift greenhouses by 1975, and that Dutch buyers at first turned away his green buds because they were used to pressed brown imports2. Between 1978 and 1984 he travelled the Hippie Trail through India, Pakistan, Afghanistan and Morocco, gathering landrace genetics and hashish that later became the raw material for his seed library2. These details come from one profile, and the other sources gathered for this page do not confirm them.
The move from seed shop to seed bank came in 1991, when Sensi bought The Seed Bank, the company previously run by Nevil Schoenmakers, who reportedly spent a short spell as Sensi's head breeder afterwards3. Leaf Nation adds that the deal was made while Schoenmakers was in custody in Australia, and that it covered all of his seed and plant stock as well as his mansion, known as the Cannabis Castle2. With rivals dissolving, the article says Sensi then became the biggest seed company in the world2. It gives no date for that milestone.
Dronkers's projects kept branching. Also in 1985 he opened the Cannabis Info Museum, billed as the world's first cannabis museum; a full remodel in 2012 turned it into today's Hash Marihuana & Hemp Museum2. In 1993 he founded HempFlax, a hemp-farming business with operations in a number of European countries2. Meanwhile, a 2011 book summarised by Wikipedia says others copied Sensi's strain names without being able to protect their own brands, and Sensi responded by launching a cheaper line of its own, White Label1.
03Culture and Connections
Sensi's roots are tangled up with Dutch cannabis culture itself. Many people point to a Rotterdam festival in June 1970, with Santana, Jefferson Airplane and Pink Floyd on the bill, as the birthplace of Dutch cannabis tolerance, and Dronkers was reportedly there selling hash and marijuana2. In 1980s Amsterdam he took part in a transatlantic swap of genetics, collecting classic stock from American grow figures such as Ed Rosenthal, Jorge Cervantes, Seattle Greg McAllister and Sam the Skunk Man2.
The company also became a tourist stop. Travel guides including Let's Go, Lonely Planet and Rick Steves recommended the museum, and the Sensi store inside it, to visitors to Amsterdam1. In 2004 Dronkers created the Cannabis Culture Awards, a yearly ceremony honouring people who took a notable stand for cannabis2. Wikipedia also lists author Chris Conrad as a Sensi consultant in the 1990s, though it spells the company 'Sensei' there, which looks like a typo1.
04Where Things Stand Now
Wikipedia calls Sensi Seeds the biggest producer of cannabis seeds in the world, with the largest cannabis seed bank1. The page gives no date for this, so it is best read as an undated claim rather than a verified current ranking. The same article still describes the company in the present tense as an Amsterdam firm selling cannabis seeds1.
No dated, current status report was found in the sources gathered for this page. A 2024 merger turned up in research notes, but no source text about it could be captured, so it is not documented here and nothing is claimed about it.
05What Comes Next
No announced future plans for Sensi Seeds were found in the sources gathered for this page. Neither the Wikipedia article nor the Leaf Nation profile describes upcoming products, expansions or strategy. Rather than guess, this section is left plain: what comes next for Sensi Seeds is not documented here, and it can be updated if a dated, reliable source appears.
On the podium, in our data
CannaLib records 42 cup results naming Sensi Seeds, between 1993 and 2025, 21 of them first places.
Where they showed up
- High Times Cannabis Cup (Amsterdam) · 24 entries
- Highlife Cup (Netherlands) · 12 entries
- The Fünkin Grövey Cup · 2 entries
- Copa Canarias / Canarian Cannabis Cup · 2 entries
- Full Moon Sesh (Berlin) · 1 entries
- Portugal Cannabis Cup · 1 entries
Strains behind the results
Sources
Written from the sources above and checked on 2026-10-29. Spot an error? Tell us on the contact page.