Grasses overflowing boundaries

May 2, 2019
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United States
I have a large fountain grass on one side of my house. It’s growing in a space where a bit of the concrete path was removed by the gas company. There is a curb surrounding the plant and this year some of the grass is coming up between the crack between the curb and the rest of the concrete. I thought about pouring vinegar or boiling water into the place where these upstarts are coming out.

My question is if that would also kill the main plant, since the offshoot is certainly coming from there.

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