Tansy

Tansy is the common name for *Tanacetum vulgare*, a perennial flowering plant in the daisy family Asteraceae.

Tansy is the common name for *Tanacetum vulgare*, a perennial flowering plant in the daisy family Asteraceae. Native to temperate Europe and Asia, it has been introduced widely elsewhere and is considered invasive or noxious in parts of North America. The plant is known for its fern-like leaves, yellow button-like flower heads, and strong aromatic odor.

Description

Tansy is a tall, aromatic perennial with erect stems, finely divided leaves, and dense clusters of small yellow flower heads. It is usually described as clump-forming and rhizomatous, with a strong odor and a bitter taste.

Distribution and habitat

The species is native to Europe and Asia but has been introduced widely, including in North and South America and Australia. It commonly grows along roadsides, disturbed ground, riverbanks, and other open habitats.

Uses and history

Tansy has a long history of use as a medicinal and ornamental plant, including cultivation in medieval gardens and by early settlers in North America. Some sources note traditional uses in folk medicine, though modern sources emphasize caution because of toxicity.

Toxicity and invasive status

Tansy is considered poisonous to livestock and potentially harmful to humans if eaten in significant amounts because of compounds such as thujone. It is also listed as a weed or restricted species in several regions where it spreads aggressively.