Cut the Grass or let it Grow Long?

Rich Rodriguez is 0-4 on grass, and ND Stadium of course is naturalgrass, plus he is 1-8 on the road with the real green stuff.
Keep the grass long to slow-up UM quarterback Denard Robinson to help prevent another 197 yards on 29 carry outing? But it will also slow up Armando Allen and Cierre Wood.  Decisions.  Decisions.