The ground should be completely inverted, but never do it in wet weather, as this will make the ground hard and cloggy.
"The Cultivation of The Native Grape, and Manufacture of American Wines"
George Husmann
"There now," she said presently, "draw yer cheer up and 'ave some tay; 't 'll be better than cloggy stuff like milk on a 'ot day like this."
"The Man Who Rose Again"
Joseph Hocking