The Q&A Archives: Wild Sedge

Question: I'm a Master Gardener but have been stumped at what to use to rid the lawn of wild sedge.

Answer: Wild sedge, or nutgrass, is extremely difficult to control. Nutgrass is an interconnected network of shoots arising from corms that are connected by rhizomes (underground stems) to other corms and tubers. Digging the plants is the most effective means of control, followed by applications of a systemic herbicide such as Round-Up. As you know, Round-Up is a contact herbicide and will kill the grass along with the pesky weed, but aside from digging the nutgrass out, it's the best alternative. Multiple applications will be necessary, but once you've eradicated the weed, you can replant the grass. If you dig the weeds out, remember that tubers that have become disconnected from the root network are not susceptible to control with systemic herbicides. After separation from the plant, tubers can remain viable for at least two years and serve as a reservoir of new nutgrass plants. Good luck with your project!

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