The grid, a network of open spaces connecting residential and employment sites to recreation areas, will create settings for future development. A £100,000 grant to link the Lower Lee Valley to the Lee Valley Regional Park is one of the supported projects.
More than 300 grid schemes are being prepared by public bodies or as part of private developments. Some 1,321ha of space is programmed for work by March 2011.
London mayor Boris Johnson said: "This investment marks a boost to help deliver this ambition by creating a network of lush green spaces where nature can thrive."