Answer: North Sea Oats (Uniola paniculata) grow from rhizomes or stolens and are best propagated by division. Although the florets are bisexual, they don't always produce viable seed. Divide your established plants by digging down and removing some of the roots with leaf blades attached. The new plants will establish quickly if divided and transplanted in the spring. I'd leave the plants alone for now - part of the beauty of ornamental grasses are the spent flowerheads as they move in the wind.
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