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Ornamental grass grows out from the center with the clumps extending a bit each year. Over time, you may notice your ornamental grass is looking sparse in the center. This is the sign that you need to divide it.
Dividing ornamental grass requires a bit of muscle. You will need a sturdy shovel, sharp shears, and perhaps a saw, ax and crowbar.
When replanting your divisions, you should cut back the foliage to about one-third to compensate for loss of moisture and any root damage which may have occurred.