Strange use of the word "grow". Don't they speak English up there any more?
And the word "grow" is quite apt, considering the size which these plants attain before being harvested.
Grow-ops are becoming a major problem for police and the neighbors of the growers and possibly unsuspecting landlords. A house that is used to grow cannabis is effectively destroyed and if the grow-op is in a city house the damage can extend to the houses next door.
One thing that the Supreme Court of Canada did right was to allow the use of infra red to spot grow-ops. These grow-ops put out distinctive intense heat signatures so a FLIR can be used from a chopper to survey a suspected location or neighborhood to get the evidence to support a warrant.