nut grass
noun
: a perennial sedge (Cyperus rotundus) of wide distribution that has slender rootstocks bearing small edible tubers resembling nuts
also : a related sedge (C. esculentus)
Example Sentences
Recent Examples on the Web In 2020, The Perfume Library launched Earthshine, a blend of the sedgy nagarmotha, or nut grass, mimosa, and the androgynous maulshree. 
Travel, 4 Jan. 2021 One of Kent’s clients had a nut grass infestation after creating a California-friendly garden of native and drought-tolerant plants. Los Angeles Times, 23 Apr. 2020
Travel, 4 Jan. 2021 One of Kent’s clients had a nut grass infestation after creating a California-friendly garden of native and drought-tolerant plants. Los Angeles Times, 23 Apr. 2020 Word History
First Known Use
1750, in the meaning defined above