Police say recent cannabis busts show how widely cultivated the drug is. 

Over the course of a month Operation Beryl busted 120 properties across Auckland, seizing 11-thousand illicit plants, estimated to be worth more than $58 million. 

More than ten tonnes of cannabis from Vietnamese organised crime groups have been destroyed. 

Detective Inspector Callum McNeill told Mike Hosking it's likely one of their largest cannabis busts ever. 

But he says the crime groups have probably already found new locations to grow new plants.  

McNeill told Hosking his main concern is the money going to trans-national organised crime groups, and going on to fund other criminal activities. 

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