Cyperus papyrus is a tall growing plant in the grass family. Often refereed to as Egyptian grass it is native to the Nile river. Mature plants can reach 8 to 9 feet tall and have triangular stems that hold a larger round bloom on top. Very exotic looking and easy to grow. Plants prefer damp to wet soil and grow great as pond plants on the edge.? We have grown them to 8 feet tall in large pots of water on decks. Prefer full sun and must keep from frost.