LONDON — We're used to hearing about cannabis plants and hothouses, but this discovery is a little more unusual. Police in London tweeted their alarm Friday when they found a whole forest of cannabis plants.

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Kingston upon Thames police were called to what they thought were going to be a few cannabis plants, instead they found a forest of something that looked more like cannabis Christmas trees.

The overgrown plants are in some cases as tall or taller than the police officers standing among them.

A police officer is somewhat dwarfed by the plants Image: MPS Grove SNT

One of the photos police posted to Twitter. Image: MPS Grove SNT

Police were alerted to the unusual find by a member of the public and stumbled upon the 150 or so plants — some over 5 feet tall — on disused private land in the leafy suburb of Kingston.

"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," PC Sarah Henderson, of Kingston borough said in a statement.

It's bad news for whoever had the somewhat half-baked idea — the whole lot will now be destroyed.