Forms dense stands which prevent establishment of other species, both due to competition and allelopathic effects. Requires disturbance to become established. When dry, is a flashy fuel which promotes wildland fires.
Seeds also cling to hair and clothing.
The tiny seeds can occur as a contaminant in imported grass seed. The University of Guam publishes a newsletter on Chromolaena. On State of Hawaii noxious weed list. Subject of an eradication program in Queensland, Australia. A declared noxious weed in South Africa.