I'm trying to remember if that's what Dad called "poor John" or if that was ragweed. Regardless of what it's called, it has zero food value, nothing I know of will eat it. I have a neighbor who baled up about 12 acres of it a few weeks ago....and there was nothing underneath it to speak of. From what I've seen since he bought that place, he has much to learn.
To my knowledge it isn't an invasive as in a foreign, introduced grass. When I took the Master Naturalist course we covered grasses and I'm pretty sure broomsedge is just another warm season, native grass. It's just that for other than cover, it's about worthless. It's invasive in that it likes poor soils and wherever they exist, you more than likely will have it. Where I am, the Ozarks abound in poor soils so we have plenty.
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