Ecological Risk Screening Summary - St. John’s Herb (Eupatorium cannabinum) - Uncertain Risk

Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.

St. John’s Herb (Eupatorium cannabinum) is an herbaceous plant that is native to the islands of the United Kingdom and Ireland. This plant has been in use and traded by humans for centuries. It has primarily been used for medicinal purposes. The history of invasiveness is None Documented. E. cannabinum has been introduced and become established around the world. There are few studies on the impacts of Eupatorium cannabinum but those published indicate only potential and not demonstrated negative ecological or economic impacts. The climate match is high for the contiguous United States. The certainty of assessment is medium. The overall risk assessment category is Uncertain.