Japanese butterbur (Petasites japonica) is a large perennial plant with huge kidney-shaped leaves up to four feet wide. This invasive plant spreads mostly through underground rhizomes (stems) and sometimes by seeds. The leaves have very long stalks (petioles) that grow directly from the rhizomes. The spikes of small, white, sweet smelling flowers appear before the leaves.
The ISCMV is working on an inventory of Japanese butterbur in Metro Vancouver to better understand its distribution and spread. If you have seen this plant, we’d like to know! Data in any form is useful, either locations for us to visit OR any inventory data you may have. Please e-mail us at [email protected].