Search:

The world is larger than North America, and wikipedia is a terrible source. http://www.invasive.org/species/weeds.cfm

Listed here is as noxious. Noxious designation is a weed that is defined as...

I'd rather idiots not go around spreading invasive species all over the place... This is the real problem with MJ. There are side effects, regardless of how bad the denialists wish to believe, but...