The plants, found at a property on Ombersley Road last night (January 15), were discovered by officers following concerns from a member of the public that the property had been left insecure.
Cannabis plants of various stages of growth and vacuum-packed harvested crops were found across 10 rooms over three floors and in the cellar of the building.
No one was in the property at the time officers discovered the grow, but there was evidence that people had been living there.
Mobile phones have been seized from the property but no arrests have been made.
A West Mercia Police spokesperson said: “Police in Worcester uncovered a large cannabis grow at a property in Ombersley Road last night (Wednesday 15 January) and have launched an investigation.
“Officers attended a former residential home following concerns from a member of the public the property was left insecure and discovered a grow of more than 1,000 plants.
“Cannabis plants of various stages of growth and vacuum-packed harvested crops were found across 10 rooms over three floors and in the cellar of the building.
“No-one was in the property but there was evidence of people living there and mobile phones were seized which are now being analysed.
“No arrests have been made so far in the investigation which is being linked to an organised crime gang and enquiries are ongoing. Officers remain at the site.”
Pictures from the scene show a large number of plants lined in rows, with windows covered in a white cloth.
Safer Neighbourhood Inspector for Worcester, Tanya Beckett, said: “We received a report of concerns over an insecure property on Ombersley Road and went to investigate yesterday evening.
“Our officers uncovered a large-scale cannabis grow which is being linked to an organised crime gang and an investigation has been launched.
“This shows we will always listen to concerns raised by the public, act on upon them swiftly and investigate where necessary.
“Illegal enterprises such as this will not be tolerated in West Mercia, and we continue to proactively work with the community to identify them, disrupt the gangs and shut them down.
“The public are our eyes and ears on the streets and we encourage anyone who has similar concerns to contact us.”