Nutsedge, often referred to as nut grass, is a common weed in landscapes and gardens in the Central Coast valleys, including Sunnyvale. The plant thrives in waterlogged soil and its presence often indicates poor drainage (particularly an issue with clay soils), too frequent irrigation or leaky sprinklers. Once established, nutsedge will tolerate normal irrigation conditions or drought, making it even more difficult to eradicate.
What is the differences between grass, sedges, and rushes? Hedges and rushes love water. Remember: Sedges have edges while rushes are round.
Lucky for me this weed is just in one low -wide bowl (6 inches deep by 15 inches wide). My treatment is easy: remove the tubers and be more attentive next year to this weed.