Dozens of cannabis plants were found by police as they probed a gas explosion at a house in Kingstanding.
It happened at around 8:15pm on Copthorne Road on Saturday.
A 30-year-old suspect suffered serious burns in the blast, West Midlands Police said. He remains in hospital.
A second man, who was also initially a suspect, was later released by police.
A police spokesman said 40 plants were found in a loft and bedroom at the address, along with specialist growing equipment.
He said the explosion came from a gas cooker and it appeared vents had been blocked in an apparent bid to conceal the smell of the cannabis.
A gas explosion has devastated a house in Kingstanding, Birmingham.
The blast blew out downstairs windows and doors at a house in Copthorne Road, Kingstanding at 8.15pm on Saturday.
A neighbour said it sounded “like a bomb going off”.
One man was taken to hospital with minor injuries.
Fire crews from Perry Barr and Erdington were sent to the scene and a structural engineer was called to assess the safety of the property.
A driver has come forward after a 5-year-old girl was left critically injured by being hit by a car in Birmingham last night.
Police say the girl was hit on College Road, Kingstanding at around 6.30pm after she became separated from her mother and walked onto the carriageway.
At around 11pm last night a 36-year-old man handed himself in to police at a Birmingham station, he was voluntarily interviewed in relation to the accident and his car was seized.
The girl currently remains in a critical condition in hospital this morning (24 October) after suffering multiple injuries. Police enquiries are ongoing.