I'm trying to go organic this year and started with cgm on the grass on all my clients lawns. However, one of my clients lawn is already has some nut grass growing on it. I already spread the corn gluten and now I'm thinkin about using weed-b-gone to be selective with the killing and fast. I'm worrying though if any progress I may have made on building soil biology will be ruined. Some ppl say it kills microorganisms and so on, but then others say it doesn't. This lawn was completely re-done with mostly annual ryegrass last year because the weeds were so bad. I don't want to end up in the same boat as the last landscaper who took care of this property.