The Common Tansy is a perennial and considered regionally noxious under the BC Weed Control Act. It has established itself on coastal BC and to many other areas of B.C., we have it all over Vancouver Island.
Tansy has yellow disc flowers that resemble buttons in a flat-topped cluster at the top of the plant. With fern-like leaves, it can grow up to 1.5 meters in height. Spread mainly through seeds and roots, It can be transported by the wind, animals, birds, clothing of hikers and on vehicles that have been in infested areas. The seeds of the plant can remain viable for up to 25 years, therefore, stopping seed spread is the main concern.
Although a pretty plant, this plant can do serious damage to our Islands natural habitat and needs to be controlled. It prefers sunny areas with well-drained soil and often infests stream banks, fields and disturbed sites such as roadsides and logged over areas. The common Tansy plant can be toxic to livestock and to humans if large quantities are consumed.