Who defines “invasive” and “noninvasive”, and how?

Whoever TF wants, obviously. For a meaningful criterion, to be invasive it needs to not only survive on its own, but either outcompete the locals, or breed explosively, i.e. be disproportionately resistant to local culling.

Japanese knotweed is far worse than kudzu, and far more resistant to cold. It strangles local plants to the point where river banks start falling apart (which only helps it too spread).

But then, even golden carp is invasive in some places. Yes, the fscking goldfish. In the Great Lakes, among the other places. On the upside, once the carps revert to their natural form and start growing to three-bricks weight or more, they become a major target for industrial-scale predation by humans, which can limit their dominance in a given body of water pretty reliably.

Who defines “invasive” and “noninvasive”, and how? Is this yet another brainworm of PSYWAR modernity needful of excision?