I’m not a botanist but my understanding is that the root balls hold a ton of energy and the plant can just keep sending out shoots, and spread underground for f

I’m not a botanist but my understanding is that the root balls hold a ton of energy and the plant can just keep sending out shoots, and spread underground for fairly long distances. So, eventually that energy source will run out, but they’re invasive because of how resilient they are at finding sneaky ways to hide and appear.