Police have destroyed 2000 cannabis plants in the past four months.

Police have arrested 79 people on drugs and firearms charges after raids on places from Kapiti and Wairarapa to Wellington.

During the past four months Wellington district police have executed more than 40 search warrants, destroyed more than 2000 cannabis plants, had significant seizures of methamphetamine and Alpha PVP.

They also seized 20 firearms and a number of assets, including a house, several vehicles and more $170,000 in cash.

Of the 79 arrested, 12 were gang members or associates, and all were facing various charges including supplying methamphetamine and cannabis, cultivating cannabis, importing Alpha PVP, unlawful possession of firearms, and various property-related offences, Wellington organised crime team head, Detective Senior Sergeant Tim Leitch, said.

During the operation police made more than 17 referrals to Child, Youth and Family about children whose lives were being affected by living in drug-dealing houses or in the care of the alleged drug dealers, he said.

Anyone with information relating to drugs supply was urged to provide the information anonymously to Crimestoppers on 0800 555 111.