Police have discovered thousands of cannabis plants growing in Sydney with an estimated street value of $13 million.

Police are searching for the people behind a $13 million cannabis operation after discovering a huge hydroponic crop in Sydney’s southwest.

At 4.30pm on Monday, officers from Camden executed a search warrant at a property on Remembrance Drive in Bargo, where they discovered 4324 cannabis plants and two shotguns.

The crop was discovered after police obtained the information through a community source.

The cannabis plants were discovered at a property on Remembrance Drive, Bargo.

The cannabis plants were discovered at a property on Remembrance Drive, Bargo.

The size of the cannabis plants ranged from seedlings to mature plants and were being cultivated in 16 large greenhouses and worksite offices.

A police guard was posted on the property on Monday night before officers returned to the scene on Tuesday.

Two shotguns were also discovered at the Bargo property. Picture: NSW Police.

Two shotguns were also discovered at the Bargo property. Picture: NSW Police.

However, there was no one at the property and it has left police searching for answers.

Police have not identified any offenders and investigations are continuing.

Anyone with information about this incident is urged to contact Crime Stoppers: 1800 333 000 or online .

The cannabis plants were found on Remembrance Drive, Bargo. Picture: NSW Police

The cannabis plants were found on Remembrance Drive, Bargo. Picture: NSW Police