Police from the Grove Safer Neighbourhood and the Met's Kingston team captioned the pictures with: 'An interesting find. We're going on a bear hunt! #TheseAren'tXmasTrees #saynotodrugs.'
Two sergeants tweeted: "Welcome to the leafy suburbs of Kingston!"
A Scotland Yard spokesman said: "Officers found more than 150 plants, some over 5ft tall, growing on wasteland. They secured the scene and are making arrangements for the plants to be removed for disposal."
"There have been no arrests at this time and inquires continue."
Police would not put a street value on the plants.
PC Sarah Henderson of the Kingston borough said: "The area these plants were growing on was the size of a football pitch - it looked like a small forest of Christmas trees and was complete with a gazebo."
"Whoever set this up used a really remote spot; the only way to get there was a 20-minute walk through wasteland. But all their time, trouble and gardening skills will go unrewarded, as the whole lot will now be destroyed by police."
- Daily Mail