Two men have been charged after NSW Police discovered $1 million worth of cannabis growing in a Riverstone factory unit.

The landlord of the property was reportedly chasing unpaid rent when he discovered the hydroponic cannabis crop and alerted police.

Police said a total of 330 plants were being grown in an “enhanced set up” with an estimated potential street value of $1 million.

Two men, 24 and 25, were refused bail to appear in Parramatta Local Court today.