Maybe I'm wrong, but that "spurge" he identifies looks like knotweed to me. Edit: did some research, looks like he's right. Difference between the two is alter

Maybe I'm wrong, but that "spurge" he identifies looks like knotweed to me. Edit: did some research, looks like he's right. Difference between the two is alternating leaves instead of side by side, and spurge has a milky sap. But otherwise appear the same