Peabody Hill Woods received a makeover from the charity's landscape team and the volunteers as work was carried out weeding, thinning and removing invasive shrubs.
Waste wood materials were taken away for chipping and a log pile was created to improve biodiversity habitat within the area. The aim was to open up the woodland, make it safer and encourage residents to enjoy their local green space.
Trees for Cities is working in partnership with the Peabody Trust to improve the wood as part of the London-wide Capital Woodlands project, a three-year London Biodiversity Partnership project supported by the Heritage Lottery Fund.
The project aims to raise appreciation of London's woodlands and increase public participation by undertaking access, biodiversity, community and training work.
Peabody Trust landscape regeneration manager Mathew Frith said: "We are making a real difference to the once neglected woodlands at Peabody Hill through the Capital Woodlands programme."
He added: "The partnership we have developed with Trees for Cities is beginning to bear fruit, and the positive impact of 100 volunteers from Time Warner will help us achieve our goal to make this a valued community asset."
Trees for Cities chief executive Graham Simmonds agreed the work was beneficial to the area: "It's great to see so much enthusiasm from the volunteers - local residents will certainly benefit from their hard work and this will help make the woodland a cleaner, safer place for everyone to enjoy."