In the sprawling urban landscapes of cities like Detroit, a hidden danger lurks in the soil. Decades of industrial activity and aging infrastructure have left a legacy of heavy metal contamination. But what if the solution wasn't a fleet of dump trucks and excavators, but a field of unassuming flowers? This is the story of how phytoremediation is being used to heal city soils, one plant at a time.

Along the busy highways of Washington State, the Washington State Department of Transportation (WSDOT) maintains yards to store equipment and materials. Over time, the soil at one such site became saturated with a toxic cocktail of diesel, oil, and other petroleum hydrocarbons. The challenge was clear: how to clean this contaminated soil effectively? The solution, it turned out, was less about industrial chemistry and more about gourmet mushrooms.

For decades, the hum of powerful aircraft at Dover Air Force Basein Delaware was a symbol of strength. But beneath the surface, a silent and invisible threat was spreading. Years of routine maintenance activities, essential for keeping planes flying, had left a legacy of chemical contamination deep in the groundwater. This is the story of how a microscopic ally was enlisted to fight a toxic enemy and win.