Originally Posted by A_J_Lath
^^I once heard an Italian chef say that the most flavoursome rocket is the stuff that grows by the roadside - apparently, all the exhaust fumes from the passing cars improve the taste (!!!) That surely can't be healthy, can it?
It's not healthy is you're in a part of the world still using leaded petrol (gasoline).
But otherwise it should be fine - although perhaps in need of a good wash to get the road dust off it.