In the pictures, taken by passerby Tony Critchley, the flames can be seen flailing up to 15 feet high.
The blaze is believed to be at an allotment site off Leger Way, near to the junction with Cheltenham Road, at Intake.
The fire has been raging since about 5pm this evening and firefighters are at the scene.
The South Yorkshire brigade has not released any details yet.
We will bring you updates as and when we get them.