Radishes: They’re not just for salad anymore. In fact, they may be useful for controlling runoff into the Chesapeake. Stuart Schwartz, senior scientist with UMBC’s Center for Urban Environmental Research and Education, spoke with Tim Wheeler, an environmental reporter for The Baltimore Sun, for Wheeler’s article, “Radishes get tryout as runoff fighters.” Wheeler writes: “City and most suburban soil is badly in need of aeration, Schwartz said. He and other researchers have found that even grass-covered ground, just below the surface, is often as dense and impermeable as concrete. Anything heavier than a light rain runs off, washing fertilizer, organic …