Nicholas Smith, 51, appeared before Peterborough Magistrates’ Court on Monday in custody.
The hearing was told that police executed a drugs search warrant at an address owned by a co-defendant. She and Smith were present at the time.
A cannabis grow including 12 large plants, nine smaller plants and some cuttings was found in the loft.
Prosecutor Qamar Iqbal said the haul had a street value of between £15,000 and £13,000.
He added: “There was also a notebook on how to grow and tend to cannabis plants.
“Messages downloaded from a phone were indicative of supply.
“In interview Mr Smith said the cannabis plants were his but for personal use. That’s not something that’s accepted by the Crown [Prosecution Service].”
Smith, of Buckminster Place, pleaded guilty to production of cannabis on December 1, 2020, and being concerned in the supply of the class B drug between July and December last year.
Mr Iqbal said that another person charged in the case is due at a crown court hearing on November 22.
Julie Murtagh, mitigating, said the co-defendant was her client’s partner and it seemed likely that the judge would see what happens to her before sentencing Smith.
Smith was committed to Peterborough Crown Court for sentencing on a date to be fixed.
He was granted unconditional bail to that hearing.