Scentless Chamomile

chamomile plant
chamomile-flower

Scentless Chamomile

Tripleurospermum inodorum

Information Sheet (PDF)


Colorado list B - Control required in Jefferson County

General

  • Family: Sunflower (Asteraceae)
  • Introduced from Europe


Common Names

  • Mayweed, scentless mayweed


Habitat

  • Can live as an annual, biennial or short-lived perennial
  • Forb
  • Found in meadows, pastures, rights-of-way, drainage area


Plant


Vegetation

  • Leaves ferny, odorless
  • Plant to 3 feet tall


Roots

  • Fibrous


Flower

  • 3/4 - 1 inch wide
  • Centers tend to dome and the petals bend down as the flowers mature
  • June - October
  • Single on each stem
  • White with yellow center


Seed

  • As many as 300,000 per plant
  • May last up to 15 years in the soil


Seedling

  • May form dense patches
  • Spring


Reproduction

  • Seed


Control


Biological

  • None


Chemical


Cultural

  • Prevention
  • Removal - make sure entire root is removed. Must be repeated as new  plants germinate
  • Shallow tillage when plants are small, before flowers form


Mechanical

  • Burning - N/A
  • Grazing - N/A May cause blistering to livestock
  • Mowing - N/A Plants will regrow


Use all chemicals according to the manufacturer's label. No specific recommendation or endorsement is made or implied by listing methods or products.

 Treatment Timeline


JanFebMarAprMayJuneJulyAugSeptOctNovDec
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Removal











Herbicide











Growth











Vegetative











Flowering











Seed