Fluorescent bulbs are also environmental hazards, why not just treat invasive plants the same way? teach people about proper disposal when they buy them, and hope they take it seriously? That's essentially what's done with fluorescent bulbs, and no-one is freaking out. I apparently just bought an invasive species and didn't even know it. I dry out and throw out extra plants I don't want anyways since I don't know if it could be invasive or not, but it would have been nice to know before I bought it that I could get in trouble for it, if it was illegal in my state(just checked, it isn't, not that I'm gonna throw it in a pond, but it's nice to know). I don't think I've broken any laws at this point, but I will have to be careful in the future. Anyways, just an idea.