Eugene wrote, speaking of the State of Georgia, USA: There is a geological feature called the Fall Line that runs from Augusta to Columbus That same fall line runs right up the eastern side of North America: I garden here in Maryland just to the west of that same fall line, on the piedmont. Speaking very broadly, the soils here are loamy clays, while a few miles to the east on the coastal plain, the soils become progressively siltier and sandier the farther east you go. Jim McKenney Montgomery County, Maryland, USA, USDA zone 7, with temperatures in the low twenties F this morning.