May 2014 AZ1628
Introduction
Many invasive, nonnative plants have become established
throughout Arizona. Of these, many are recognized as noxious
weeds: a plant species that has been designated by state,
federal or other agricultural or land management authority
as economically or ecologically harmful to agricultural or
horticultural crops, natural habitats or ecosystems, and
humans or livestock. Noxious weeds are regulated by law and
merit...

extension.arizona.edu