Bulrush

This perennial relative of the Egyptian Papyrus reed can grow up to 3 m tall and grows along and in fresh or brackish water. Until the beginning of the 19th century, the stems of the Mattenbies (Schoenoplectus lacustris) were widely used to make rush baskets, floor mats, and chair seats. The stately stems bloom beautifully with deep brown spikelets.
Many parts of the plant are eaten: the roots are rich in starch and are ground into powder or made into a syrup. The buds at the end of the rhizomes are fresh and sweet, making them excellent to eat raw! Young stem shoots are harvested in the spring and eaten raw or cooked. The ground seeds or pollen are a flavorful addition to flour, which is used to bake cakes.
Some medicinal properties can be found online.

Names:
Latin: Schoenoplectus lacustris
Dutch: Mattenbies
English: Common Clubrush, Bulrush