"Another problem is people leaving their cars unlocked on driveways, sometimes with valuables in view.
Thieves will canvas every property until they see an opportunity. They are also very quick, so don't make it easy for them."
As well as locking houses, sheds, garages, and cars, Ms Robilliard suggested people think about installing alarms and CCTV and having dogs.
Northland Detective Sergeant John Miller, who runs the annual blitz on cannabis, said as growers made moves to establish crops in the bush, police started getting information.
"We are getting information about suspicious movements," Mr Miller said. "People are getting located in the bush claiming to be hunting but they have no gun or dog and are carrying a backpack."
As people realised they could leave information anonymously on the Crimestoppers line - 0800 555 111 - it meant more people were dobbing in dope growers. Mr Miller said attention should be given to houses that could be home to indoor growing operations where growers were cloning plants, growing them to a certain size and then selling them to outdoor operators.
"It's a massive market - about 80 per cent of cannabis grown outdoors starts indoors," he said.
The annual drug recovery operation earlier this year netted the second highest number of cannabis plants destroyed by Northland police. Officers ripped out or sprayed a whopping 67,191 plants - up on last year's total of 46,224 plants.