Why is it a problem?
- Spreads by lateral roots and seeds (up to 50,000 per plant), transported by water, animals, humans
- Can restrict stream flow when growing along waterways
- Somewhat toxic to grazing animals
- Garden escapee; also grows in areas with natural or man-made disturbances, such as roadsides, waterways, and beach meadows, forest understories
- Displaces native plants and associated with several plant viruses
- Can cause dermatitis of the skin when touched
How do I manage this plant?
- Clean boots and equipment before leaving a contaminated site
- Maintain desirable plants as groundcover, as Tansy does not germinate in vegetated areas or where there is a leaf litter layer
- Small clumps can be pulled or dug, taking care to remove rhizome fragments (wear gloves)
- Mowing several times a year prior to seed set can contain a population
- Herbicides are most effective when applied in spring
