Almost 50,000 free trees are up for grabs - with Londoners being invited to apply to have them planted in their schools, back gardens, local parks and nearby green spaces.
The City Hall giveaway is part of plans to turn London into a National Park City - and will go someway to help authorities tackle air pollution.
London Live spoke to The Deputy Mayor for Environment and Energy, Shirley Rodrigues, and local residents in Brixton.
The Mayor has partnered with the Woodland Trust, which will provide 24,000 trees free of charge for Londoners to plant in their gardens, with a further 25,000 trees being offered to community groups and schools across the capital, in partnership with community charity The Conservation Volunteers.
Apply by 5 November at www.london.gov.uk/plant-a-tree