Adding more confusion to nutsedge's identification, another of its common names is nutgrass. Comparatively, true grassy weeds have round stems. Roundup is a nonselective herbicide, which means that it doesn't discriminate between weed types, so it is an effective weed killer for nutsedge.

Does Roundup work on nutgrass?

Roundup is effective at killing all kinds of nutsedge. The Glyphosate in Roundup will infiltrate sedge plants through the leaves and travel to the root tubers, killing the sedge completely. However, Roundup is a non-selective herbicide. ... Roundup will also kill turf grasses and any other plants exposed to the herbicide.

How long does it take Roundup to kill nutgrass?

Nutsedge control

It can only be controlled by a post-emergent herbicide. The key to controlling nutsedge is to kill off the nutlet with a herbicide product, most control products take about 10-14 days to completely kill off the plant. It is difficult to get rid of nutsedge and it may require multiple treatments.