The 1sq m planters, billowing with verbenas, geraniums and fuchsias, will be in place for a month on sites such as Exchange Square, designated a London 2012 Live Site that will show all of the events on a big screen.
Supplier Plantscape, based in Derbyshire, recently flowered up the suburbs of Moston, Rusholme, Chorlton-cum-Hardy and Fallowfield to sport the London 2012 colours of blue, gold, green, pink and orange.
Manchester City Council is also using the planters to mark Dig the City. The six-day horticulture festival to promote community-based gardening starts on 24 July.
Exchange Square has been turned into an urban garden with pavilion bar, trees, picnic tables and picket fence.