Cannabis plants estimated to be worth more than AU $7.5 million have been seized in a series of raids across northern NSW.

Drug squad detectives raided more than 60 rural sites over the past five days, including at Kippenduff, Rappville, Clearfield, Busby Flat, Mummulgum, Bulldog, Drake, Nimbin, Blue Knob, Kyogle and Tabulam.

They found and destroyed more than 3730 cannabis plants.

The raids were part of an annual eradication program that NSW Police says has prevented cannabis worth almost AU $240 million from reaching the streets since the mid-1980s.


"Illegal cannabis growers choose their growing locations based on the mistaken belief that police won't find them," Detective Acting Superintendent Steve Patton said in a statement.

"However, as we prove with this program every year, we have the resources to find these crops and put a dent in the cannabis market."