Bloom Town: The wild life of American cities

One of America’s hottest cities and one of its coldest may have more in common than you would guess. In places like Phoenix and Minneapolis, scientists think that cities are starting to look alike in ways that have nothing to do with the proliferation of Starbucks, WalMart or T.G.I Fridays. It has to do with the flowers we plant and the fertilizers we use and the choices we make every spring when we emerge from our apartments and homes and descend on local garden centers.