This has been discussed many times before, but one of the reasons one sees so many young/new/small trees on our public rights-of-way is largely due to the difficult conditions for street trees in this city. When not being fed a steady diet of winter salt, street trees in this city have traditionally not been given sufficient space to grow, or have been planted in a manner which either deprives them of water or drowns them. It's only fairly recently, particularly at Waterfront Toronto, that public authorities in this town have gotten serious about giving street trees a fighting chance, with minimum soil volumes, silva cells, etc.