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Question DetailsAsked on 9/28/2015

I have nut grass on my lawn. I have tried some treatments recommended by local nursery but in vain. Suggestions?

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From my successful experience, treatments don't work well without using ones that kill everything like all-species Roundup, which is one solution (like with crabgrass) - kill the entire area, then after a few months retopsoil and reseed with lawn seed. Or for small areas dig the area up at least 6-12 inches deep (be sure to get utility locates) and dispose of that soil, and replace with new clean soil and reestablish your lawn.

Roundup Poison Ivy Plus tough Brush Killer will also kill it - hand brush onto the nut grass every two days for two weeks does pretty much any plant in (though bamboo and some rushes take a month of such treatment). Expect some collateral lawn damage even if you are careful with the brushing because it takes just drops to kill adjacent grass. There will be a few roots aqnd nuts that survive this so expect a couple of cycles of this to get it all - and of course that assumes it is not regenerating from neighbors.

Best easy way - keep lawn from standing wet - this sedge likes wet feet, so spreading out the watering cycle so the ground dries out between waterings helps a lot, as does garden lime application because it likes acidic conditions. Then, mowing to about 3 inch height rather than short helps a lot because then the lawn grass can crowd/shade out the nut grass.

Answered 5 years ago by LCD

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