It was the largest illegal marijuana grow operation ever shut down by Niagara Regional Police.
Police have been investigating the grow-op at Third Street Louth and Main Street in St. Catharines since May.
Police searched the place on Tuesday and have arrested 11 people.
They face a list of drug related charges.
More than 17,000 plants were seized by police.
The value is about $34-million.
Niagara Child Care Centres Moving
The region says there should be no disruption to service, the new sites are on the region's websites
St. Catharines Holds Off Boulevard Planting
City council leaving it open to volunteers, similar to what is in Mississauga
Man Charged with Gun and Drug Offences
Police searched a home in Niagara Falls, finding cocaine, fentanyl, guns and money, suspect had a bail hearing
Niagara Man Charged with Child Luring
Police arrested him after posing as "child" on internet
St. Catharines Trying for Development Near Hospital
It has to do with a vacant lot, and quest for residential properties
NRP Release Robbery Suspects Pics
Roberts Jewellery in Niagara Falls robbed last month
Update: Police Charge Another Man, Other Charges Dropped
Police say man was stabbed while sitting on Niagara Falls park bench
Speed Cameras Considered Near Schools
This is in Welland, where city council heard there are too many complaints of speeding