Marestail or horseweed (Erigeron canadensis) is a challenging weed to manage in no-till or minimum-till soybeans systems. This weed is classified as a winter annual, but it germinates well into spring and summer, making it even more difficult to manage. In addition to an extended germination window, marestail can produce up to 200,000 seeds/plant, with approximately 80% of those seeds being able to germinate immediately after maturation. Kansas producers also face the added difficulty of trying to manage glyphosate-and ALS-resistant marestail.