Answer: Cyperus Papyrus is indeed a vigorous plant. Yours sounds too happy! The best way to control the growth is to confine the root system. Dig it up while you still can, divide it, and plant it in a large container. You can bury the container in the ground if you wish. Keeping the roots confined will keep the top smaller. You'll still have an attractive plant, but it will be much smaller and easier to take care of.
Best wishes with your landscape!
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