Greenhouse seeds are a prize winning Dutch seed bank who have worked with the Dutch government to create many strains of cannabis seeds

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Extract from our grow guide

Cannabis is an annual herb - that is to say it germinates, flowers, sets seed and dies in one year. Male and female flowering parts appear on separate plants (although it is possible to grow hermaphrodites).

Cannabis has two main varieties, cannabis sativa and cannabis indica.

Sativa is characterised by a tall growth habit, slender fingered leaves, lowish flower to leaf ratio and rather long flowering period.

Indica is characterised by a bushier growth pattern with wider fingered leaves, a higher flower to leaf ratio and a shorter, more predictable flowering period.

When smoked, sativa gives a clear, up, cerebral high while indica produces a 'stonier' more physical hit. In the last few decades, enthusiasts have created sativa/indica hybrids which combine the best features of both varieties.

The weather in the UK does not entirely suit the requirements of what is, essentially, a tropical plant. This guide attempts to show how a carefully controlled environment coupled with a suitable choice of plant variety can produce herb of the highest quality. In the author's opinion, herb grown organically tastes and smells better than hydroponically grown; therefore a compost-based method is fully described but fans of hydroponic methods will find that the principles outlined still hold good.

For more info on growing cannabis read our cannabis grow guide


 



The Greenhouse Seed Company is one of the first seed companies to grow marijuana commercially from Holland. In 1986 they began their pedigree breeding program to develop new seed strains. Greenhouse Seeds aim was to develop stronger different flavoured strains to what the market currently offered providing the consumer with a greater variety. Greenhouse Seed Company thought that developing stronger seed strains would also prevent cannabis users from seeking harder drugs by providing a genuine strong cannabis alternative to hard drugs.

The Greenhouse Seed Company breeding program to develop the new strains used new growing methods including using new substrates , climatic controls and new nutrient formulas served to the plants using new methods. The breeding program was a success.

The first Green House , coffee shop , Tolstraat , opened soon after and popularity of the seed strains grew as more people sampled the new strains on offer at the shop. Master Kush and Cytral were a big success and Greenhouse were proud to have them represented at the 1st High Times Cannabis Cup.

A second Green House coffee shop, Waterlooplein, opened in 1995. The artistic looking shop won the Cannabis Cup for the best looking coffee shop that year. As the Greenhouse Seed Company continued to grow they looked for a partner and a collaboration with a former Sensi Seed breeder led to a third Green House shop in 1997.

Green house seeds have been off the map in the seed growing world for the last couple of years as they have been involved in medical trials with the Dutch government but they are now back and with some new strains which are sure to impress


NEW - CHEESE female

   
5 fem seeds 10 fem seeds
£20 £38
In stock In stock

 

Cheese is a unique strain, until now, available as clone form only.  Like many cannabis strains the history and origins of Cheese are somewhat confused and distorted.

Cheese originated in 1988-89 as one unique female phenotype out of packet of Sensi Seeds Skunk No. 1 grown somewhere in the Chiltern Hills.  This one plant produced impressively large buds and had a very distinctive cheesy odour.  It was quickly cloned and named Cheese.

Around 1995 a Cheese clone was passed on to Exodus, an alternative community living in Haz Hall on the edges of Luton.  Exodus organised free parties, championed the legalisation of cannabis, grew cannabis themselves and protected each other from the law.  They also started CANABIS (Campaign Against Narcotic Abuse Because of Ignorance in Society).  Because of all the people that passed through the Exodus community many clones were handed out to visitors and the strain continued to grow in notoriety. 

For many years Cheese has passed around an underground network of growers in the UK, helped by Exodus and others.

It is now available for the first time as a feminised strain!


NEW - Lemon skunk female

   
5 fem seeds 10 fem seeds
£20 £38
In stock In stock

 

Awards: HighLife 1st Place 2006.
Genetics: Old school Skunk, from the Amsterdam underground..
Effect: Smooth citrus flavor, complex effect, well balanced and long-lasting..
Flowering indoor: Ready in 8 weeks, but an extra week will increase dramatically terpens content in the resin, resulting in a much richer flavor. Production up to 600 grams per square meter.
Flowering outdoor: Ready beginning October, good resistance to botrytis. Production up to 800 grams per plant.


NEW - Train wreck female

   
5 fem seeds 10 fem seeds
£20 £38
out of stock out of stock

 

TrainWreck ® (Feminised)
Awards: Not introduced to competitions yet.
Genetics: Original clone from Arcata, USA. Reversed 100% feminized.
Effect: Like the name suggests, a real blast. It hits fast, and it hits hard. Stoney on the body, confusing and trippy on the brain. A truly powerful smoke.
Flowering indoor: Ready in 8 weeks, expect a lot of resin and tower-like calyx formation deforming the buds in the final stages of ripening.
Production up to 500 grams per square meter.
Flowering outdoor: Ready beginning October, with stretchy branches and long shaped colas.
Production up to 700 grams per plant.


Arjan's Haze #1

5 reg seeds 10 reg seeds
£40 £69
In stock In stock
5 fem seeds 10 fem seeds
£45 £75
In stock In stock

 

 

Awards: 1st place High Times Cannabis Cup 2004 People Cup.

Pedigree: Secret pedigree.

Strength: Uplifting high, strong
and long lasting.
THC: 22.3%
CBD: 0.9%
CBN: 0.7%

Flowering time:
Indoors: finishes in 11 weeks
Outdoors: in the Northern hemisphere will finish in midOctober. In the Southern hemisphere in May. 
The yield is around 350 to 450 gr/sqm.
The quality is superior, with a thc content up to 23%.

A must for all connoisseurs
and breeders, it is a very special plant.

Arjan's Haze #2

NO IMAGE

5 fem seeds 10 fem seeds
£30 £55
OUT OF STOCK OUT OF STOCK

 

 

Awards: not yet introduced in
competitions.
Genetics: Neville’s Haze, Super Silver Haze, Laos.
Effect: strong, introspective high, with a deep effect on the body due to the high CBD level. Very intense taste, nutty and woody
Flowering indoor: 9-10 weeks will deliver rock-hard sativa buds covered in shiny white resin. Yield between 600 and 800 gr/sqm.
Flowering outdoor: it finishes between 15 and 30 October in most areas of the Northern hemisphere, or in mid May in the Southern. Production up to 1000 gr/plant.
THC: 21.7% CBD: 1.6% CBN: 0.5%

Arjan's Haze #3

NO IMAGE

5 fem seeds 10 fem seeds
£25 £45
In stock In stock

 

 

Awards: not yet introduced in
competitions.
Genetics: Haze, Laos.
Effect: euphoric high, very social and
creative. One of the fruitiest and
sweetest between the sativas.
Flowering indoor: 10-11 weeks with a yield of 500-700 gr/sqm. Very short sativa, ideal for indoor growers!
Flowering outdoor: will finish by mid October in the Northern hemisphere, or by mid May in the Southern. Yield up to 1000 gr/plant.
THC: 20.5% CBD: 1% CBN: 0.6%

Arjan's strawberry haze

NO IMAGE

5 fem seeds 10 fem seeds
£25 £47.5
In stock In stock

 

 

Awards: not yet introduced to
competitions.
Genetics: Swiss sativa, NL5 Haze Mist.
Effect: Very mild body effect, strong
cerebral high. Very creative and social. Voted best strain at the Green House V.I.S. Smoking Panel 2005.
Flowering indoor: most growers harvest after 10 weeks. A week longer will allow
maximum flavour. Yield 500 to 600 gr/sqm.
Flowering outdoor: ready around end of October in the Northern hemisphere; around end of May in the Southern.
Yield up to 800 gr/plant.
THC: 20,4% CBD: 1.2% CBN: 0.9%

Arjan's ultra haze #1

NO IMAGE

5 fem seeds 10 fem seeds
£25 £47.5
In stock In stock

 

 

Awards: not yet introduced to
competitions.
Genetics: Neville’s Haze, Cambodian, Laos.
Effect: very intense sativa high, a real blast. A very psychedelic feeling.
Flowering indoor: 13 weeks will deliver ripe sativa buds with heavy density and
amazing resin. Expect a yield up to 900 gr/sqm.
Flowering outdoor: ready at the end of November in the Northern hemisphere and in June in the Southern one.
Massive yield: up to 1300 gr/plant.
THC: 21.6% CBD: 0.8% CBN: 0.6%

Arjan's ultra haze #2

NO IMAGE

5 fem seeds 10 fem seeds
£25 £47.5
In stock In stock

 

 

Awards: 2nd prize HTCC 2005.
3rd prize Champions Cup 2005.
3rd prize Highlife 2006.
Genetics: Neville's Haze, Mango Haze, Laos.
Effect: great psychoactive high, strong and long lasting. Very uplifting and social, it leaves a very relaxing feeling thanks to the high CBD. Fruity and woody sativa taste.
Flowering indoor: 12-13 weeks with a yield of 700-800 gr/sqm.
Flowering outdoor: finishes by mid November in the Northern hemisphere, or by mid June in the Southern. Production can reach 1000 gr/plant. Long buds with loads of resin.
THC: 22.9% CBD: 1.1% CBN: 0.5%

A.M.S (anti mold strain)

 

5 fem seeds 10 fem seeds
£15 £27.50
In stock In stock

 

 

Awards: not yet introduced in competitions.
Genetics: Swiss sativa, Swiss indica.
Effect: Strong high, with a clearside and a more introspective one. Very particular taste, sweet and complex.
Flowering indoor: 9 weeks will deliver the most amount of resin. Commercial growers harvest in 8 weeks. Yield between 500 and 700 gr/sqm.
Flowering outdoor: will finish by begin
October in the Northern hemisphere, or by mid May in the Southern. Yield up to 800 gr/plant. Mould resistant strain!
THC: 15% CBD: 1.1% CBN: 0.7%

Big Bang

5 fem seeds 10 fem seeds
£17 £30.00
in stock in stock

 

 

Awards: 3rd prize HTCC 2000.
Genetics: Skunk, Northern Light, El Niño.
Effect: very known for its medicinal
properties, it is sold in the Dutch
pharmacies as prescription medicine. Relaxing and calming effect.
Flowering indoor: 9 weeks will guarantee the full range of cannabinoids. Commercially ready in 8 weeks. Yield up to 800 gr/sqm. Very good on SOG and ScrOG systems.
Flowering outdoor: ready at the beginning of October in the Northern hemisphere and in April in the Southern one.
Yield up to 1000 gr/plant.
THC: 15,5% CBD: 1.5% CBN: 0.4%

The Church

5 fem seeds 10 fem seeds
£17 £30.00
In stock In stock

 

 

Awards: not yet introduced to
competitions.
Genetics: Swiss sativa, Skunk, Super Skunk, Northern Lights.
Effect: a heavy indica feeling that evolves in a long lasting cerebral high. A special taste and a very social effect.
Flowering indoor: 9 weeks, with a yield of 700 to 800 gr/ sqm.
Flowering outdoor: ready in early October above the equator, in early May in the Southern hemisphere. Yield up to 900 gr/plant. Great resin production and very resistent to mould! Recommended for humid or rainy areas.
THC: 16.8% CBD: 0.7% CBN: 0.6%

 


The Doctor

5 fem seeds 10 fem seeds
£15 £27.50
Out of stock Out of Stock

 

 

Awards: not yet introduced to
competitions.
Genetics: Great White Shark, South Indian, Super Skunk.
Effect: very strong indica with instant body effect, stoned and very long lasting.
Flowering indoor: ready to harvest in 8 weeks. An extra week will give amazing resin and a sweeter taste. Yield up to 800 gr/sqm.
Flowering outdoor: ready around the end of September in the Northern hemisphere; or around end of April in the Southern.
Yield up to 1200 gr/plant.
THC: 18.4% CBD: 1.1% CBN: 0.4%

Hawaiian Snow


5 reg seeds 10 reg seeds
£40 £69
Out of stock Out of stock
5 fem seeds 10 fem seeds
£45 £75
OUT OF STOCK OUT OF STOCK
Awards:
1st prize HTCC 2003.

Pedigree:
Hawaiian x Laos.

Strength:
Powerful creative high
and a delightfully smooth
stoned feeling.
THC: 23.7%
CBD: 1.1%
CBN: 0.8%

Flowering Time:
Indoor: 12 to 13 weeks.
Expected yield of 550 to 600 gr/sqm.
Outdoor: it will be finished by the beginning of
November in the Northern hemisphere. In the
Southern hemisphere finishes by late July.
Voted at the Cannabis Cup as the best quality cannabis made in 2003 in Holland. A true must for all growers.

Super Silver Haze

5 reg seeds 10 reg seeds
£40 £69
In stock In stock
5 fem seeds 10 fem seeds
£45 £75
In stock In stock
Awards:
1st prize HTCC 1997, 1998
and 1999

Pedigree:
Skunk, Northern Lights, Haze.

Strength:
A creepy high and a very  powerful body feeling.
THC: 18.0%
CBD: 0.3%
CBN: 0.1%

Flowering time:
Indoor: expect it to be ready after 11 weeks.
Pure quality and good quantity are yielded with an average of 450 gr/sqm.
Outdoor: In the Northern hemisphere it is ready by beginning October while in the Southern hemisphere finishes by May.

Nevilles Haze


5 reg seeds 10 reg seeds
£40 £69
In stock In stock
5 fem seeds 10 fem seeds
£45 £75
In stock In stock
Awards:
1st prize Seed Copmpany
HTCC 1998

Pedigree:
Almost pure Haze

Strength:
Very strong cerebral high, a true connoisseur choice.
THC: 21.0%
CBD: 1.1%
CBN: 0.2%

Flowering time:
Indoor: 12 to 14 weeks, with a production of 450 gr/sqm.
Outdoor: In the Northern hemisphere it is expected to be ready by late
October while in the Southern one by the end of April.

White widow

 

5 reg seeds 10 reg seeds
£20 £35
In stock In stock
5 fem seeds 10 fem seeds
£30 £49
In stock In stock
Awards:
1st prize BIO HTCC 1995

Pedigree:
Brazilian and South Indian.

Strength:
Extremely stong indica
feeling, with a creepy
sativa high to complement
the effect.
THC: 12.0%
CBD: 1.4%
CBN: 0.6%

Flowering time:
indoor: 9 weeks, with an expected yield of 350 to 450 gr/sqm.
outdoor: expect it finished by mid October in Northern hemisphere. Or by the end of May in the Southern hemisphere. Moderate yield, but connoisseur quality. One of the whitest varieties ever bred.

White rhino

5 reg seeds 10 reg seeds
£20