JoeReal
Goutweed is indeed very hard to get rid of in your lawn because it produces via underground rhizomes. You really have to dig out wide areas of lawn, take out the rhizomes and replant with weed-free sod.
But before you do such drastic measures, I would have done the following method which I used on our other problem weeds here. I use two flat cardboard panels made from carton boxes, enough for me to kneel on. On each of the panel, I cut out matching semi-circles on each panel. The idea is I can put the two cardboard panels together with the goutweed in the middle of the completed circle, simply overlap the boxes together for a better fit depending on size of the goutweed, but the lawn is protected below. I then spray with RoundUp, the exposed portion of goutweed, while the grass below is protected from roundup. Since Roundup is systemic, the chemicals are translocated into the underground rhizomes to kill off the weed. Problem with this method is that it is laborius or time consuming plus if you are sensitive to chemicals, then this method is not for you, but there are other alternatives.
Another alternative is that if you can't take them out, then you can control their rapid growth. Frequent mowing to shorter grass height will provide good control of their spread. This prevents the plants from photosynthesizing too much as the leaves are frequently mowed, so their rhizomes won't develop and won't spread further.
There are some more details in the links below:
Orignal From: How can I get rid of gout weed that is growing into my grass?
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