This was an experiment by a kindergarten class. They dropped seeds in cracks of the sidewalk to see what would happen.

[FakeNoose]

8. It's a nice idea as long as regular rains come to nourish the flowers

I'm sure it would work in Pittsburgh, where we have rainy months in the spring and early summer. BUT we also have deer that would come along and munch like it's a free salad bar every night.