So, during the summer spot treat by just spraying patches of buttonweed. Minimize spraying the lawn grass as much as possible. ... Glyphosate (Roundup, Killzall and other brands) does a good job of killing this weed, but it kills the lawn grass as well – which is an issue.

What is the best herbicide to kill Virginia Buttonweed?

Metsulfuron (as the only ingredient in a product like MSM) or Celsius WG can be sprayed on weeds in warm-season turfgrass during the lawn's spring green-up period. Celsius WG provides good to excellent control of Virginia buttonweed, while metsulfuron offers good control.

What does roundup not kill?

Roundup: The herbicide active ingredient in Roundup is glyphosate, which if sprayed on the lawn will kill not only the weeds but the lawn. ... When used properly it will not kill the desirable turfgrasses in the lawn. This is a selective herbicide that controls specific weeds, but not lawn grasses.