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Sedgehammer is a selective post-emergent herbicide built around halosulfuron-methyl, aimed at nutsedge (nutgrass) and a handful of tough broadleaf and grassy weeds in turfgrass and landscaped beds. It is sold as small water-soluble granules that you mix in a sprayer and apply over the top of established lawns, and it is labeled for residential, commercial and industrial sites. It suits homeowners fighting yellow or purple nutsedge that ordinary 2,4-D and three-way lawn weed killers leave behind. The trade-off is speed: nutsedge yellows and stalls within a couple of weeks but full kill takes several weeks, and sedge that has already formed tubers often needs a second pass.
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Lowest price we've seen: $114.99 on Nov 11 at Amazon. Tracked across 1 store since Nov 11.
Rated 4.3 out of 5 from 57 ratings, buyers mostly report it works on nutsedge where other weed killers failed, though several note it takes weeks and sometimes a second application to finish the job.
Gowan Sedgehammer is a selective herbicide for post-emergent control of nutsedge and other weeds. It is used in turfgrass and landscaped areas.
It can be used at residential, commercial and industrial sites to control select weeds that have already emerged.