I cut a small area of my yard as short as I could, (about an inch). Then I seeded the area, and also the area next to it for comparison, (3"). I used Scotts "Classic" a cheap mix, with 28 percent ryegrass. No rake-in or soil preparation. Area was irrigated and semi-shade. Temps were about highs of 65. After about a week the short-cut grass had recovered to almost the same height, as the normal-cut grass. At 14 days new grass sprouts were visible, but tiny. It was difficult to tell if the new grass had "taken" sucessfully. More later.