Cops sniff out cannabis plants during operation.
And when officers searched the property they discovered plants had been grown and harvested.
Julia Yarnel, 53, who admitted a charge of producing cannabis, was sentenced to a 12 month community order.
Judge Melbourne Inman QC said "There was no evidence of any supply to anybody else and it was not a sophisticated set-up.
Nevertheless there was a significant amount hanging out to dry, probably approaching a kilo" Charles Gardner, prosecuting at Birmingham Crown Court, said on the morning of December 4 last year police went to an address in Boldmoor Lake Road, Erdington, on a matter which had nothing to do with the defendant.
As they stood outside the door of a house they were interested in they were approached by Yarnel's son.
"At that stage they became aware of an overpowering smell of cannabis," said Mr Gardner.
He said the police were let in and in an upstairs room found 200 stems of cannabis plants hanging out to dry.
Tariq Rashid, defending, said Yarnel, who had no previous drug-related offences, had suffered from severe depression, back pain and diabetes.