Cannabis cultivation is the cultivation of the Cannabis Sativa plant. Subspecies are C. sativa subsp. sativa and C. sativa subsp. indica. Wild or escaped Cannabis, previously classified as Cannabis ruderalis, is now regarded as the variety C. sativa subsp sativa var. spontanea. Various hybrids are cultivated. Cannabis is grown for a variety of purposes, including as a source of materials for use in various products, such as food, clothing, cosmetics and fuel and for the production of cannabis drug materials. Cultivation techniques for other purposes are very different: see Hemp.
The drug material is used medicinally, recreationally, and spiritually, but its possession is illegal in most places. See: Legal issues of cannabis.
The legal status of cannabis has led growers to implement novel cultivation methods for indoor growing, in order to avoid aerial surveillance of outdoor plots.  These methods include: using a water or air-based growth medium (known as hydroponics and aeroponics respectively); the use of homemade, organic composted fertilizers; training and trellising techniques such as Screen of Green (also known as SCROG), Sea of Green (also known as SOG); and entire systems and methods such as the NIMBY no-dump method, Hempy Bucket, and the Krusty Freedom Bucket methods. Research into the production of cannabis for the drug Marinol and other more profitable and marketable forms of cannabis based medicines has further pushed the envelope of cannabis cultivation in all forms of laboratory, both public and private.
The emphasis on advanced cultivation techniques, as well as the availability of hybrid strains (with names like Northern Lights, Master Kush, NYC Diesel), is believed to be a factor in the increase in the overall quality and variety of commercially-available cannabis over the past few decades. However, it should be noted that well-grown heirloom strains (e.g. Thai, Colombian Gold, Panama Red) are still in use. The following covers the plant's entire growth, from germination to harvest.
*Great Article http://www.thestar.com/News/article/172748
Another great grow-op has been discovered.
Officers were "speechless" when they stumbled upon the massive cannabis factory in the grounds of a large detached house.
The pool outhouse was decked out with infra-red lighting, heaters and ventilation equipment and there was a sea of marijuana greenery instead of water.
While grow-op busts make big headlines, the growers themselves usually get away with a slap on the wrist. According to a study released in March titled "Marijuana Growing Operations in British Columbia Revisited," by Darryl Plecas, a criminology professor at University College of the Fraser Valley in Abbotsford, B.C., there were 25,014 cases that came to the attention of police between 1997 and 2003. In 54 percent of cases where police found pot on the scene, they took no action, usually because there were no suspects or there were less than ten plants. Of those found guilty, only about 16 percent received prison sentences. The average sentence was just under five months.
"It's very disturbing. There's something like 10,000 in the greater Toronto area and 50,000 across Canada, probably more,"
BARRIE, ONT. - Calling it the largest and most sophisticated marijuana operation in Canadian history, Ontario police said they have seized 30,000 plants which they say is worth more than $30 million in a former Molson brewery facility.
Barrie police Chief Wayne Frechette said the growing facility was a "massive operation" that proved "organized crime is present in most, if not all, of our communities."
"This is not a Ma and Pa operation," he said.
Nine men were arrested in connection with the operation. Investigators say they later uncovered 3,000 more marijuana plants in a nearby industrial complex.
Police said both operations were conducted on a 24-hour basis.
The former brewery was raided Saturday by about 100 Barrie and provincial police officers acting on a tip.
Police said the growers used more than 5,574 square metres in the operation. They also had living accommodations for up to 50 people, including common areas, televisions, refrigerators and stoves.
More than 1,000 grow lights were used, police said.
According to police, millions of dollars were invested in equipment for the operation, which was capable of producing up to three or four crops a year. Vats previously used by the brewery housed hundreds of plants.
Molson closed the brewery in 2000, and sold the building to a company that leases out space to a number of other businesses.
Written by CBC News Online staff