Common tansy (Tanacetum vulgare) is a perennial & is an invasive weed in Western Canada. It over-competes native species due to its prolific spread primarily through seed dispersion. Seeds from this plant can remain viable for 25 years.

Stock photo: Common tansy (Tanacetum vulgare) is a perennial & is an invasive weed in Western Canada. It over-competes native species due to its prolific spread primarily through seed dispersion. Seeds from this plant can remain viable for 25 years. was taken by phsiii .