Papyrus (Cyperus papyrus) is a marginal aquatic plant. You can try both approaches to see which works best in your conditions.
Cut off the top tufts, float them in a bowl of water in a cool, sunny room (above freezing). They'll root and grow new foliage.
Keep the original plant in its pot, barely moist—not standing water. A cool, attached garage with windows is ideal. Water weekly.
Both can be moved back outdoors or to a sunny window in spring. The water‑rooted cuttings make great new plants.
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