Common yarrow's impact on biodiversity in New York

By Blake Jackson

Common yarrow (Achillea millefolium), once valued for its medicinal benefits and use in landscaping, has become a significant invasive species in New York.

Its rapid growth and aggressive spread are causing concern as it outcompetes native plants and disrupts local ecosystems.

Identifying Common Yarrow

This plant can be identified by its fern-like, feathery leaves and small clusters of white to pink flowers, which bloom from late spring to early fall.

Common yarrow is adaptable and grows in a wide range of environments, including fields, roadsides, and disturbed areas. Its ability to thrive in diverse conditions makes it a resilient invasive species.

Impacts on Local Ecosystems

Common yarrow poses several ecological challenges. Its dense growth can overshadow native plants, reducing biodiversity and altering natural habitats.

This displacement of native species harms wildlife that depend on those plants for food and shelter. Additionally, yarrow’s presence can alter soil chemistry, making the environment less hospitable for native flora, further exacerbating the issue.

Management Strategies

To manage common yarrow, landowners and managers can adopt several strategies:

• Manual Removal: For small infestations, pulling the plants up by their roots is effective. Ensure that all roots are removed to prevent regrowth.
• Mowing: Regular mowing prevents yarrow from flowering and producing seeds. However, this should be combined with other methods for lasting control.
• Herbicides: In larger infestations, targeted herbicide application may be necessary. It’s important to consult local environmental experts for advice on safe, effective herbicide use.
• Replanting Native Species: After removing yarrow, reintroducing native plants can help restore the ecosystem and reduce the likelihood of re-infestation.

Combatting common yarrow in New York requires community efforts and vigilance. By identifying and managing this invasive species, we can help preserve local biodiversity and support healthier ecosystems.

Photo Credit: pexels-tom-van-dyck