Green Flag Award scheme manager Paul Todd has said burgeoning urban populations mean that the awards are becoming more important than ever.
His comment follows news that a record total of 1,476 parks and green spaces have been awarded Green Flags this year.
Of those, the capital's parks won a record 300 Green Flags this year for meeting the benchmark national standard. London also received 39 community awards, given to small, community-based and -managed projects in open spaces.
Todd, from organiser Keep Britain Tidy, said: "Green spaces are going to become more vital for communities in urban areas like London - particularly as their populations increase.
"One of the things we have seen is that a number of boroughs in London have really taken on board the awards' standard and have set it at the heart of their work.
"What's encouraging is that these parks are being supported by local authorities, which are increasing their number of Green Flags year on year as people recognise the importance of green spaces and how important they are in improving people's health and well-being."
Green Flag winners
A full list of winners alongside case studies of Green Flag-holding parks and green spaces can be found here.