Originally reported as Giant Hogweed (Heracleum mantegazzianum)
Submitter does not have a specimen
Two plants:
one large, about 4-5’ tall with multi lobed leaves and large dry umbral flower tops, possibly after spreading seed. Stalk was hollow and about 2” in diameter with red splotchy spots.
2nd smaller plant, brand new growth only about 12” out of the ground.