Six fire engines and around 40 firefighters responded to a fire on Newquay Road, Bellingham.
The fire was located at the rear of two adjoining residential streets. The gardens of six properties on Newquay Road and four properties on Arran Road were involved in the fire. One shed, lengths of fencing and some shrubbery were destroyed by the fire. There are no reports of any injuries,
The fire is believed to have been accidental and was caused by the burning of garden waste.
A London Fire Brigade spokesperson said: "We would urge people to consider if their bonfire is necessary and to take care if you’re burning waste at home or at work.
"If you’re having a bonfire never leave it unattended and consider your neighbours.
"Make sure you build it clear of buildings, garden sheds, fences and hedges and never use flammable liquids to start it or burn dangerous items such as aerosol cans. Always keep a bucket of water or a hosepipe nearby in case of fire.
“Always check your local authority’s advice on bonfires and follow our safety tips."
The Brigade received the first of 20 calls reporting the fire at 1334, and crews from Lewisham, Forest Hill, Lee Green and surrounding stations have been sent to the scene. Firefighters had the incident under control by 1510.