Officers who searched an industrial estate in Cumbernauld, North Lanarkshire, recovered more than 2,000 plants.
They targeted a commercial premises in the town's Mid Road at around 5.30pm on Tuesday.
Police Scotland said inquiries into the find are continuing.
Sergeant Michelle Thomson said: "Police Scotland will continue to pursue those involved in the drugs trade. This is a significant recovery and will certainly have an impact on those involved in the cultivation and further distribution of these drugs."
The seizure comes after police recovered drugs worth £1.1 million in a van they pulled over on the M74 on Tuesday.
Officers discovered around 110 kilograms of amphetamine sulphate, or speed, in a vehicle near Larkhall, South Lanarkshire.
A 43-year-old man was arrested.