the easiest way i've found is mowing really short during the growing season, my aunt had a bed that was full of it (infected due to a friends donated plant), she turned it into lawn and mowed it (well Uncle mowed it, aunt watched from a deck chair with a G&T) and after three years it was pretty much gone and it hadn't spread
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You need to do a 2-3x a year treatment for 3-4 years to drastically reduce the problem, then a 1x annual spot as they appear after that.