As much as state officials in North Dakota hated leafy spurge (Euphorbia esula), they have learned to hate yellow starthistle (Centaurea solstitialis) even more. So much so, that, according to this article from the Bismarck Tribune, the state senate unanimously passed a bill establishing a zero tolerance policy for the invasive plant. Going beyond existing federal regulations, the law makes it illegal to sell agricultural seed if it contains any yellow starthistle. Also being eyed suspiciously by state officials: saltcedar (Tamarix spp.). To see the text of the bill, click here.