Plant id

[Bucksnbears]

Anyone know what this is?

My riverbottom is the only place I've ever seen it. Grows about 5 feet tall and has huge leaves with a white head.
Grows in small pockets.

 

[IowaBowHunter1983]

Hogweed

 

[Bucksnbears]

Thank you Sir!

 

[Steve-O]

Invasive. Kill it. Watch out for the toxic sap