Agronomy •  2024-01-24

How to identify & control: Common Tansy (Tanacetum vulgare)

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Introduced in North America from Europe in the 1600s, Common Tansy has bright yellow, aromatic flowers and has been used medicinally—despite it being toxic to humans and animals if consumed in large quantities—and as an insect repellent. It forms dense stands that can grow up to 1.5 metres tall, flourishes in full sun, well-drained soil, and reproduces using underground horizontal roots and seeds. It can outcompete and displace native plants, reducing natural biodiversity and available forage for wildlife and livestock.1 Common Tansy is most commonly found on stream banks, and along roadsides and other disturbed soil sites.2

Identifying Common Tansy

  • Stems are branched, erect, a purple- green colour and dotted with glands
  • Leaves alternate on the stem, showing thin, individual leaves with toothed edges
  • Flowers are button-like and resemble small commercial asters, as the plant is part of the aster family.3
  • Seeds are yellow-brown in colour with short, five-toothed crowns

common tansy

Controlling Common Tansy

common tansy

Common tansy spreads via roots and seeds that can remain viable in the soil for up to 25 years4; each plant can produce over 2,000 seeds5.  For this reason control measures should be approached with a long-term management plan in mind.

For best results, apply: Reclaim™ II herbicide at 20 acres per case + Gateway™ adjuvant at 0.2% v/v (200 ml per 100 L of spray solution). Apply in a minimum of 20 gallons per acre of spray solution for ground applications.

Application Timing: 
Apply when actively growing from rosette stage to bolting.

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