The police helicopter crew were faced with an unusual task after spotting 32 cannabis plants growing around Lake Joondalup.
Wanneroo Sgt Bob Corden said his officers tried to reach the plants on foot but the deep marshy ground and snakes at the freshwater lake made it too dangerous.
Instead, officers in the helicopter pulled out the plants yesterday and delivered them to colleagues on the ground.
Sgt Corden said police were investigating whether the crop was planted deliberately. There were no clear tracks to the plants, which were 40cm to 180cm high.