Six fire engines and 35 firefighters and officers attended a fire in the yard of a garden centre in Bullsmoor Lane, Enfield, last week.
A stack of about 100 wooden pallets and a row of trees at the rear of the centre were damaged in the blaze.
No-one was injured in the incident.
Fire engines from Enfield, Edmonton, Chingford and Woodford fire station were at the scene.
The fire is believed to have been cause by embers travelling from a bonfire in a park at the rear of the yard.
The Brigade was called at 2206 and the fire was under control at 2319.