Cannabis growing across the Central Districts, including Tararua, has been punished by Operation Jasmin, with more than 6000 plants taken and 163 arrests.
Operation Jasmin is the police annual crime and cannabis operation.
More than 4000 plants were recovered from the aerial phase in Central Districts, with the remaining 2000 plants coming from search warrants.
Tararua, Manawatu and Horowhenua accounted for nearly 1000 plants.
Police estimated $20 million dollars had been saved in social harm costs from the operation.