Answer: Nimblewill is a warm-season turfgrass that will infest cool-season turf. It has excellent winter hardiness which allows it to establish and compete. It will often stay dormant (white-to-tan) until Memorial Day and will go dormant soon after Labor Day. Nimble will has the growth habit of bermudagrass but is hairless and somewhat more upright.
There is no easy method for controlling nimblewill, because there is no herbicide that will kill this weed and not kill the existing turfgrass, too. The easiest means of control is to spray patches of nimbleweed with a total-kill herbicide like RoundUp. Spray a circle 10-12 inches larger on each side than the existing patch, to ensure that all stolons are killed. Allow the grass 2-3 weeks to die back, then reseed or re-sod the area with a shade tolerant turfgrass cultivar.
A common mistake made by homeowners is not killing a large enough area of grass initially, and inadvertently leaving some nimblewill alive. When this happens the patches will re-grow, and the control process must to be repeated.
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