Establishment of native plant communities on degraded sites often requires control of invasive species such as spotted knapweed (Centaurea stoebe L.), but the persistence of knapweed in restored plant communities is uncertain. Since 2009, we have studied the effects of various treatments, including burning, on native plant community development on a knapweed-infested site in western Michigan. Prescribed burns were conducted in spring 2012, 2014, and 2015, with fire intensities varying with timing, weather, and grass cover. Burning has increased bare soil, reduced non-native grass and forb cover, and increased cover of native grasses. While burning also has increased the cover of certain native forbs such as sand coreopsis and butterfly weed, it has decreased the cover of others, including horsemint and wild bergamot. Knapweed cover has been declining on all treatments, but burning effects on knapweed have been slow to develop. In 2015, burning significantly decreased mature knapweed densities.