LONDON -- British police say an elderly couple unwittingly grew a monstrous cannabis plant in their yard after buying what they thought was an innocuous green bush at a flea market.

Police in Bedford, a commuter town 90 kilometers (55 miles) from central London, posted a picture of a luxuriant cannabis plant growing as tall as the fence in what appeared to be someone's back yard.

In a message posted to Twitter Friday the force said the plant had been "seized today."

"Elderly couple bought shrub at car boot sale, tended carefully-biggest cannabis plant we had seen!!" the message exclaimed.

Further details about the couple – or how either it or police got wise to the plant's true nature – weren't immediately available late Monday.

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Online:

Bedford Police's message:

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