This week’s “I Spy” is a ‘common’ invasive in the Sea to Sky region, so kudos if you got it!
Common Tansy (Tanacetum vulgare) is a perennial herbaceous flowering plant that can be found throughout the Sea to Sky region. Originally introduced from Europe in the 1600’s, it is now considered regionally noxious under the BC Weed Control Act.
Common Tansy has yellow button-shaped flowers that grow in clusters at the top of plants, and can have anywhere between 20 to 200 flowers per plant. The leaves are dark green and divided, with serrated leaflets that are 10 – 20 cm long and 4 – 8 cm wide. Each plant can grow to 1.8 m in height with the stems turning a purplish-red colour when mature.
Odds are that if you live in the Sea to Sky region, you’ve seen Common Tansy growing in your neighborhood. It thrives in sunny areas with well-drained soils and can be found on stream banks, in pastures, and other disturbed sites such as roadways.
Common Tansy can be toxic to humans if consumed in large quantities and is considered toxic and an undesirable forage for livestock. It even renders milk bitter when cows consume it!
If you’ve spotted Common Tansy, please remember to report it to either email@example.com, ssisc.ca/report or at (604) 698-8334.