Ironweeds must be tough guys. To prove it they stand tall along our roads and in our fields. They've spread across eastern North America. And they flaunt their purple color with pride and impunity. So don't be too surprised in late summer, when suddenly ironweed is old, and starts to wear purple. Giant ironweed grows in AL, AR, DE, FL, GA, IA, IL, IN, KS, KY, LA, MD, MI, MO, MS, NC, NY(E), NH, OK, PA, SC, TN, TX, VA, WV, and ON. Lenawee Co MI, 8/5/10.