Dustin from Fulshear Texas writes
Nufarm Polaris Herbicide is not labeled for marsh dewflower (murdannia keisak) which is in the spiderwort family.
Unfortunately, after reviewing multiple products, it appears that there is not a product specifically labeled for this weed in lawns. We would recommend using a non selective herbicide containing glyphosate such as RoundUp QuickPro to spot treat the weeds directly and then reseeding/resodding after 2 weeks.
Answer last updated on: 08/17/2021