this plant is a menace.. and you will rue the day it ever showed up in your garden ...

and we would be all set if i could remember the name of it ... lol ..

one thing for sure.. do not let it seed any further ... at a min remove the seed.. and then figure out how to kill the rest ...

i would probably go with a spray killer like round up.. as digging in rocks is not fum.. and every spot you disturb the soil.. will probably sprout more weeds.. the downside to rock as a mulch ...

ken

ps: maybe a sedge??

nutsedge

And pulling them does not remove the nutlet or tuber in the soil which will produce a new plant.

https://hgic.clemson.edu/factsheet/nutsedge/

I hope it never shows up at my house!! Yikes!!
debra