Ornamental grasses are fairly new to the landscape scene as they've increased in popularity in the past couple of decades. Most ornamental grasses are easy to grow, requiring little water and fertilizer and no pesticides. Unlike rose bushes or boxwood hedges, there's not really a tried-and-true method for pruning or grooming ornamental grasses. If you don't cut or groom ornamental grasses in the fall, they can become shaggy messes by spring. One recommended advise is to cut grasses down to a few inches above the ground in fall or spring and dividing clumps when the grass' growth begins to weaken.

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Source: The Spruce