POLICE have seized three garbage bags full of cannabis leaves left on the side of a road with a sign saying "Free dope smoke. Mull up".

A member of the public called police when he saw the haul on Bolong Rd, Bomaderry, on NSW's south coast about 10am on Saturday morning.

Officers found 16kg of cannabis leaves in the bags, which they seized and destroyed.

Anyone with information on cannabis plants being grown should contact CrimeStoppers or Shoalhaven LAC.