I think it's kind of silly, stupid, and a waste of city's resources...money, mostly. Who is going to get up there and tend that tiny green space forever so it doesn't wilt in this heat or die in the winter, etc?
Lots of open surface lots in this city that could be turned into green spaces. Something larger and by a private company, such as the green roof on the PECO building, that's something nice to have. This, OTOH, not so much.
"The only difference between the Republican and Democratic parties is the velocities with which their knees hit the floor when corporations knock on their door. That's the only difference."
- Ralph Nader