Sited between the new St Peter's Square Metrolink stop and Manchester Town Hall, the trees are part of Manchester City Council's flagship redevelopment of the square into shat it calls "a major new civic space".
Eventually totalling 22 the trees include the Japanese pagoda tree (Styphnolobium japonicum), the foxglove tree (Paulownia tomentosa), the London plane (Platanus × acerifolia) and the pin oak (Quercus palustris), each having been grown in specialist nurseries for up to seven years.
Councillor Andrew Fender, chair of the Transport for Greater Manchester Committee, said: "St Peter's Square has a proud history and it's fantastic to see this next step in its evolution really taking shape.
"These trees will make a really pleasant setting for the tram stop, with two actually being planted on the tram platforms, nestling between canopies to give customers shade."
The Metrolink improvement works form part of the Grow programme, which will see more than £1billion invested in city centre infrastructure improvements by next year.