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In 1985 the Sensi Seed Club was born, considered the founding year of the bank, and that same year he opened the Hash Marihuana & Hemp Museum in Amsterdam. During the eighties, Dronkers was one of the few Dutch growers with access to genetics such as Skunk #1, Original Haze or Northern Lights, brought from the United States. In 1991 he acquired The Seed Bank, Nevil Schoenmakers' bank, and merged both collections into the Sensi Seed Bank, which became the largest cannabis seed bank in the world.
Since then, Sensi Seeds has remained a family business. His children have played a key role: Alan Dronkers drove the breeding programs of the early nineties, Gio Dronkers joined in 2004 and today leads the company, and Ravi Spaarenberg is in charge of research and development. In 2023 the brand reached the United States market and in 2025 it celebrated its 40 years of history.
During his first years as a grower, nobody wanted to buy Ben Dronkers' flowers. Dutch consumers were accustomed to hashish and imported, pressed and brown-colored weed, so those green and fresh buds seemed strange to them. According to Dronkers himself, they even called them "spinach". Today those same genetics form part of the foundation of modern cultivation worldwide.
Sensi Seeds' lines
Sensi Seeds' catalog brings together hundreds of varieties and combines the preservation of historical genetics with new breeding projects. Many of its varieties are available in several formats, so that the same genetic can be found as regular, feminized or autoflowering. Knowing each line helps to choose the most suitable variety according to space, climate and available time.
Sensi Seeds classics
It is the heart of the bank and where the varieties that marked an era are found. Here are foundational genetics such as Skunk #1, Northern Lights, Hindu Kush, Afghani #1, Super Skunk, Hash Plant or Northern Lights #5 x Haze. Later classics such as Big Bud, Black Domina, Silver Haze, Mr. Nice or Shiva Shanti were added, the latter named in honor of two family members. Many of these varieties continue to be offered in regular format, highly valued by breeders.
Jack Herer
It deserves a separate mention. Jack Herer was presented at the 1994 Cannabis Cup, where it took first prize, and was named after the American activist author of The Emperor Wears No Clothes, one of the most influential books in favor of hemp and legalization. Over time it has become one of the most well-known varieties in the world. Furthermore, it was the genetic chosen by Bedrocan, the Dutch producer of standardized medicinal cannabis, to develop products that are dispensed in pharmacies in the Netherlands.
Feminized and autoflowering
To adapt to the needs of today's grower, Sensi Seeds offers feminized and autoflowering versions of many of its classics. Feminized eliminate the need to identify and remove males, while autoflowering flower according to their age and not according to light hours. They are a good option for home cultivation, small spaces or for those looking for faster harvests.
Growing cannabis in small spaces
Growing marijuana indoors can be a very pleasant and interesting activity. Not having nough space may seem an issue, but in this post we'll tell you how to make a mini cannabis grow using few space at home. From small growing tents to micro crops, you have lots of possibilities to fit your grow in almost any corner of your house.
Research and Breeding Grounds
Alongside the classic line, the brand develops new genetics through Sensi Seeds Research and the Breeding Grounds project. The latter invites emerging growers to work with the gene bank, facilities and Sensi team, and has resulted in varieties such as Mandarine Jam, Candy Hash or Bad Apple. Additionally, the brand has White Label, its second seed brand.
Beyond seeds
Ben Dronkers' influence goes far beyond cultivation. In 1993 he founded HempFlax, with which he promoted the recovery of industrial hemp in the Netherlands. In 1998, Sensi Seeds became the first seed company in the country to obtain an exemption from the opium law to cultivate and preserve cannabis. And in 2012 it opened the Hash Marihuana & Hemp Museum in Barcelona, in the Palau Mornau, a 16th century palace, as a sister site to the Amsterdam museum.
Awards and recognitions
Sensi Seeds has received 13 best seed bank awards throughout its history, as well as numerous awards for its varieties. Some of the most notable milestones are:
- 1993: sweeps the seed bank category at the High Times Cannabis Cup.
- 1994: Jack Herer wins first prize at the 7th Cannabis Cup.
- 2013: Ben Dronkers enters the High Times Counterculture Hall of Fame.
Which line to choose?
The breadth of the catalog allows finding a suitable variety for almost any situation. As a general guide, each line fits better with a specific type of cultivation:
- Historical genetics: Skunk #1, Northern Lights or Hindu Kush.
- Own breeding projects: regular seeds of the classics.
- Cultivation without males: feminized versions.
- Fast harvests or small spaces: autoflowering.
- New genetics: varieties from Research and Breeding Grounds.
Forty years after its founding, Sensi Seeds remains one of the most respected names in cannabis. Its catalog combines the preservation of legendary genetics with new breeding projects, and is a good choice for both beginners and experienced growers. This category brings together its entire collection so that each grower can find the variety that best suits their way of working.
