First thing I thought about was fluidizing the grass via forced air. Plenty of bulky stuff is handled fluidized. One good example is the hydraulic french fry ma

First thing I thought about was fluidizing the grass via forced air. Plenty of bulky stuff is handled fluidized. One good example is the hydraulic french fry maker where potatoes are fluidized using water and pushed through a slicing grate using the pressure and velocity of the flow. The water carries the french fries out of the other side just as easily.