Name this weed?

[Wi transplant]

I see this on occasion in fallow/ crp fields and its from 5 to 8ft tall with a very stiff stalk. Just wondering what it is ? Was thinking of adding to some " dirty" switchgrass pockets im creating on my new farm . Good idea or very bad? Thoughts?

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[Nrharris]

Marestail is my guess.

 

[Sligh1]

x2 ^^^^^

 

[Muskrat24]

X3

 

[Snail3496]

That is marestail