This summer, Southern District Police are asking the public to look out for cannabis-growing operations, or related suspicious activity.
Detective Sergeant Regan Boucher said cannabis was often grown in areas near walking tracks with a nearby water source, so people ''can help by keeping an eye out for this type of crop''.
''Plants grown outside are likely to be noticeable at this time of the year, either due to their bright lime-green colouring or because growers have fenced their plots to prevent predation by pests.''
Anyone who came across a cannabis plot was urged to stay clear of the operation and pass the location to police.
Police were committed to disrupting the supply chain and reducing the demand for cannabis, Det Sgt Boucher said.
''Cannabis destroys lives and relationships and causes millions of dollars of social harm each year, when users commit crimes such as burglary and theft to fund their habits.''
He urged anyone with information about drug cultivation, manufacture or supply across Otago to contact their local police station.
Information can also be provided anonymously to Crimestoppers on 0800 555 111.
What to look for
How to spot a cannabis-growing operation
• People repeatedly visiting specific locations at unusual times, day or night.
• People carrying shovels, spades and similar tools into the bush.
• Vehicles parked in rural areas with difficult access or areas closed to the public.
• Unusual sightings of lights/head torches/headlights in rural areas at night.
• Distinctive smell coming from rural areas or properties.
• Theft of fencing equipment or farm bikes from rural properties.
Source: New Zealand Police
