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Green House Seed Company | About the Green House Seed Company

The Green House Seed Company is the most successful cannabis business in the world.

Our seeds are neither genetically modified nor fungicidally treated.

Winner of many international awards (40 High times Cannabis Cups, 17 Highlife Cups, and many more private awards in many countries), it is leader in cannabis genetics.

Arjan, owner and founder, has been acclaimed The King of Cannabis for his amazing record of cannabis prizes won throughout his career. He has always been committed to create the best genetics in the world, and to ensure that the growers choose the best genetics, based upon their location, logistics and personal knowledge.

Arjan started collecting genetics and landraces from all over the world 25 years ago, and the hunt is still on! (

Green House Seed Company genetics are the result of years of intensive breeding. All strains have exceptional medicinal as well as recreational properties, as well as particular terpene profiles guaranteeing unique aromas and flavors.

An overview of some of the most popular Green House strains:

The first and most important distinction to be made is the choice between growing outdoor or indoor. Once the decision is made, it is important to get the right type of seeds for the purpose. Most cannabis plants can be grown indoor or outdoor, but the peculiar characteristics of each strain always guarantee best results in one of the two ways. The personal or commercial nature of the operation will always influence the choice of the genetics. Sativas are usually regarded as higher quality, while indica strains are faster and more commercial.

Between the over 20 strains now sold by the Green House Seed Company there are true indoor champions and true outdoor champions. The Himalaya Gold is the most recommended outdoor plant, because of its genetic resistance to cold nights, altitude, pests and diseases. The origin of the plant is from the Himalayan region, and it proved an incredibly versatile and adaptable plant. Growers in the mountain regions of Italy and Spain love the Himalaya Gold for its high yields and sweet strong indica characteristics. Another true outdoor champion is the Arjan’s Haze # 1, with great production and unique sativa high. The Arjan’s Haze # 1 performs very well indoor, but outdoor the plants can grow to reach their development- peak and the maximum productivity. Moreover, solar light activates the production of a wider range of cannabinoids in the buds, guaranteeing a truly psychedelic effect. Besides, it finishes flowering in 11 weeks, allowing cultivation in most southern European countries.

On the indoor side, the best plants of the Green House Seed Company are Great White Shark, White Rhino, El Nino and the White Widow. All these strains belong to the “white” family and share a common genetic origin. They are shorter, bushier plants with great bud production and amazing resin production. The bouquet and taste vary considerably, as well as the effect. The White Rhino in particular is very suitable for Sea of Green systems, where the plants are kept very close to one another and flowered at an early stage. It has a sweet taste and a great narcotic effect that made it popular with MS patients and chronic pain patients.

The Great White Shark and The Doctor are very popular between indica lovers worldwide. Their yields are amazing and the buds rock-hard.

The Hawaiian Snow, the Strawberry Haze and the Neville’s Haze are good outdoor or indoor plants, but are mostly grown indoor because of their longer flowering time. Sometimes these varieties are given 12 hours of light from the very beginning, to keep them short and to shorten the flowering time. These are high-grade sativas, with an uplifting high and a very woody earthy flavor.

There are also plants that are very suitable for both indoor and outdoor conditions, such as the El Niño, the Alaskan Ice, the K-Train and the Super Silver Haze. These strains will perform incredibly good both ways, with some differences in plant development and yield. The Super Silver Haze in particular can produce more when grown outdoor, as the plants can develop taller and stronger branches can sustain the heavy buds.

The choice of the genetics remains one of the key factors in the success of every grower or breeder, and it is very important to acquire the most information before committing to the task.

Arjan, the owner of the Green House, always had a vision to normalise cannabis all around the world, for both medicinal and recreational use.

Since opening the first Green House Coffeeshop, Arjan has established an empire of cannabis businesses, with 4 cannabis coffeeshops in Amsterdam, one cannabis social club in Barcelona, two very successful cannabis seed banks, an award winning cannabis film/documentary company, an award winning nutrient company, a foundation and several other cannabis businesses. He is considered one of the most important figures in the cannabis industry. Losing his beloved brother Franco on the 2nd of January 2017 was a major setback for Arjan and the Green House family, however Franco left behind a legacy, that the team will continue pursuing. On March 2017 VICE on HBO featured “Kings of Cannabis: Congo”, this was Franco Loja’s last appearance before he passed away from Malaria while working in Congo.

Green House Seed Company continues to be at the forefront of the fight for cannabis legalization around the world.

If you come to Amsterdam please visit our Shops and ask for a seed catalogue! We will be happy to advise the best for your needs. Or, if you live too far from Amsterdam to pay a visit, check our online shop on (No sales of seeds to USA, sorry!)

Arjan & the Green House Seed Company team


70% SATIVA – 30% INDICA THC: 29,50% CBD: 0,201% CBN: 0,36% Genetics SUPER LEMON HAZE X CLEMENTINE Effects The effects are very balanced from the citrusy terpenes that will give you some euphoric feeling, and the earthier background that will give you a sweet headbuzz that can last for a while. Indoor Flowering Cycle: 9 [...]


50% SATIVA – 50% INDICA THC: 25,12% CBD: 0,89% CBN: 0,51% Genetics Watermelon Zkittlez X Cloud Walker Effects The effects of the flower will rise slowly after smoking it and settle in your head bit by bit, giving you first a great uplifting and energetic high, followed by some soft and warm bodyfeeling that will [...]


AlienZ 40% SATIVA – 60% INDICA THC: 24,30% CBD: 0,14% CBN: 0,40% Genetics Watermelon Zkittlez x Velvet Moon Effects The effect are strong and long lasting, they give some gigly feelings and good mood, perfect for social events or for relaxing after a stressfull day. Indoor Flowering Cycle: 8-9 Weeks Yield: High Average height: 120-180cm [...]

MIMOSA X KING’S KUSH The King’s Juice is a combination of two of Arjan’s favorite terpene profiles. Our selected Mimosa from Symbiotic Genetics, which has deep floral perfumes that the King loves so much, combined with our famous King’s Kush with its citrusy potency. The flowers have an amazing smell that perfectly balance out the [...]


MIMOSA X KING’S KUSH The King’s Juice is a combination of two of Arjan’s favorite terpene profiles. Our selected Mimosa from Symbiotic Genetics, which has deep floral perfumes that the King loves so much, combined with our famous King’s Kush with its citrusy potency. The flowers have an amazing smell that perfectly balance out the [...]


WEDDING CAKE X OG KUSH Wonder Pie is a cross of the popular Wedding Cake with our selected OG Kush. The flavor goes from fruity, sweet to gassy making it an allround strain. The influences from Triangle Kush and Cookies ancestors are dominant, while the OG Kush flavor comes through on the exhale. Flowering Cycle: [...]


BRAZILIAN X SOUTH INDIAN The White Widow is very famous for its relaxing indica feeling that turns into a bursting sativa high. It produces some of the frostiest flowers since it came out in the 90’s, and gained a reputation for its complex and enjoyable, fast hit and long-lasting effect Flowering Cycle: 8-9 Weeks Yield: [...]


HAZE X RED SKUNK The Jack Herer is one of the mythical strain in the cannabisworld. Famous for its beautiful structure and huge long flowers, it also has that sativa smell. A mix of tree sap and pinetree, combined with some sweetness and a metallic background. A timeless strain to grow for any sativa lover. [...]


JACK HERER X RUDERALIS The Jack Herer is one of those mythical strain in the cannabis world. Famous for its beautiful structure and huge, long flowers. In our autoflowering version of it, the strain keeps that sativa smell, a mix of tree sap and pinetree combined with some sweetness and a metallic background. A timeless [...]


GUAVA X GELATO #41 AUTO Our auto-flowering version of Gelato #41 has been crossed with the best selection of Guava to create a sweet, full-bodied strain that is perfect for lovers of tropical flavors. The effects of this cross are characterized by a great feeling of relaxation, without losing focus. In fact, it is considered [...]


GELATO #41 X GELATO #41 AUTO If you are looking for the perfect auto-flowering version of Gelato #41, then this is your strain! After careful research, we have selected only the most satisfying plants that reflect the main characters of this famous USA genetic. The effects are relaxing, calming, and perfect for a chill moment. [...]


EXODUS CHEESE X SHERBERT OG The Fullgas! Is a tribute to our late beloved brother Franco Loja. His favorite strain was the Exodus Cheese. We combined his favorite with our selection of Sunset Sherbert x Diagonal Og by Cannarado Genetics to add some gassyness and potency. The results is a perfect mix of both worlds [...]