University of California Agriculture and Natural Resources released information on April 18 about the challenges posed by nutsedge, a common weed found in lawns, gardens, and flower beds across the Central Valley and throughout California.
Nutsedge is known for its aggressive growth and persistence. It can quickly overtake turf areas if not managed properly. The weed thrives in poorly drained or water-logged soil, often growing faster and taller than surrounding grass. Two species are prevalent in California: Cyperus esculentus (yellow sedge) and Cyperus rotundus (purple sedge). Both species produce underground tubers that make them difficult to control once established.
According to University of California Agriculture and Natural Resources, prevention is key because nutsedges are hard to remove after they have developed their rhizomes with tubers. Homeowners are advised to avoid overwatering their lawns to prevent poor drainage conditions that favor the weed’s growth. Removing small plants early—before they develop tubers—is recommended for better control. If an infestation occurs, digging out patches at least eight inches deep may be necessary.
The organization also advises using landscape fabrics made from polypropylene polymers as an effective method for suppressing nutsedge growth while allowing water and air permeability. Chemical options exist but should be used with caution; most herbicides do not reach the underground tubers, requiring repeated applications as new plants emerge.
University of California Agriculture and Natural Resources secures funding through public contributions to support its programs, according to the official website. The institution promotes sustainable practices aimed at strengthening resilient ecosystems and economic vitality according to the official website. Its nine research and extension centers serve as laboratories representing diverse Californian ecosystems according to the official website.
Additionally, University of California Agriculture and Natural Resources has gained recognition for linking research directly with community needs according to the official website. As part of the University of California system, it manages Cooperative Extension services across communities according to the official website, conducting more than 33,000 educational events annually with over 18,000 volunteers involved in its initiatives according to the official website.
Vigilance remains important when dealing with nutsedge infestations since persistent monitoring is required for successful removal.