ARRESTING SEA OF GREEN

Detective Hunt unloads the seized cannabis plants after arriving back at Wollongong Police Station on Friday morning.

POLICE expect to arrest two men over the seizure of a $2 million cannabis plantation discovered near Helensburgh on Friday.

Police from the Wollongong Proactive Deployment Unit raided the bushland site around 7am last Friday, spending several hours locating and retrieving 300 cannabis plants.

Police say the plants had been secreted within the area's natural foliage and were scattered in a number of plots, each containing 80 to 100 plants located several kilometres apart.

"Each site was well set up and well irrigated," said Detective Sergeant Jason Stevenson, who is heading the investigation.

"They had built dams to water each site.

"They would have had to have come in and tend to the plants every couple of days.

"It was a very well organised crop."

Police also discovered well-worn tracks between the crop sites, which helped them to track down each site without the aid of the police helicopter.

The plants were believed to be 12 months old, with an average height of 1.5 metres.

The sites had been under investigation since late last year after police received a tip-off.