A marijuana stash and hydroponic equipment were revealed after a small fire broke out at a rental property in Adelaide at about 8am.

Police stumbled across the drug crop after the 52-year-old man living there dislocated his shoulder while trying to put out the fire.

Investigators claim the fire was caused by electricity that had been illegally diverted to the house.

A marijuana crop was discovered after a house fire in Adelaide. (9News)

A total of 31 cannabis plants and close to 90 seedlings were removed from two grow rooms at the Pratt Avenue residence.

Police allege the occupant tried to hide some of the plants by throwing them over a back fence.

The occupant of the rental property has been charged. (9News)

The man has been charged with cultivating a large commercial quantity of cannabis, possessing proscribed equipment, and diverting electricity.