Answer: The grass will die back after freezing weather, so you need to trim it off quite short to about four inches. You can do this in the fall or the later winter/early spring before it starts to grow again. The time to divide would be early next spring. The roots of this plant are extremely tough so plan on using an axe or a saw to divide it. When you replant, allow ample space for the divisions to mature, they can easily spread five feet or more wide at maturity. Usually these plants are left undivided until they begin to die out at the center of the clump and form a sort of donut shape of vigorous growth -- maybe five years or more. By then, it is really a huge job to divide one. Good luck with your project!
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