Skanska is expected to sub-contract specialist landscape contracting firms in the new year.
The southern part of the Olympic Park will include riverside gardens and areas for markets, events, cafes and bars in legacy.
The landscape and public realm contract includes hard and soft landscape works, tree planting and the construction of the concourse which will link all the venues, entrances and parklands.
The work will also include lighting, irrigation and drainage and delivering the Sarah Price-designed London 2012 Garden stretching for half a mile between the Aquatics Centre and Olympic Stadium and celebrating centuries of British passion for gardens and plants.
The contractor will also deliver the Great British Garden, which two amateur gardeners are helping to design after their competition entries won a public vote.
Bam Nuttall was appointed to deliver the north park and selected Frosts Landscapes Construction to undertake the west soft landscape package, which includes the installation of drainage, irrigation, completion of the earthworks, planting of the trees and shrubs, installation of footpaths and terraced seating areas. The remaining soft landscape package for the east side has been awarded to White Horse Contractors.