www.wildlflower.org reports its from. The USA states of AR, AZ,CA, CO, CT, DE, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MIN, MN, MON, MS, MT, NC, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SC, TN, TX, UT, VA, VT, WA, WI AND WY. and in The Canadian provinces of AB, BC, MB, NB, NT, ON, PE, QC, SK. It also grows as far south as Puebla, Mexico. There it is known as estafiate. Some botanists consider much of the Eastern populations to be escaped from garden populations. We propagated our plants from a wild population on a Beaufort Co., SC roadside.