Central Victorian Response Unit's Sergeant Mick Peckham said officers uncovered three "crop houses" after executing search warrants in the area. 

Police raided two residential properties in High Street and Doolan Crescent and a factory in Pink Cliffs Road.

Sergeant Peckham said it was one of the largest drug raids he had been involved in. 

"It's definitely one of the largest (raids) I have been associated with," he said.

"It's a pleasing result.

"I guess the pleasing thing from a police perspective is those drugs are no longer going to hit the street.

"The drugs are not going to go to our youth.

​"There will be no flow-on effect."

A 56-year-old Heathcote woman was arrested and interviewed over her connection with the three properties, but was later released pending further inquiries. 

No charges have been laid. 

The exact number of plants seized was 771. 

Sergeant Peckham said the plants varied in size, ranging from seedlings to mature plants. 

He said the manufacture or growing of illicit drugs was unacceptable. 

"I hope that these raids send a clear message to those who think that they can grow or manufacture drugs into our community that we are watching and will take action," he said. 

Specialised police, uniform police and members of the dog squad were involved in the raids. 

Two botanists also attended to help police examine the plants. 

The raids took place about 8.30am. 

The raids followed a lengthy investigation into the manufacture of cannabis in the local area. 

Investigations are ongoing. 

Sergeant Peckham said people with information about drug manufacturing activity in the area should contact their local police station or CrimeStoppers on 1800 333 000. 

"We encourage people to contact their local police station if they know of anything," he said. 

"(People should) rest assured that action is taken and the results achieved."