Yellow Starthistle, Centaurea solstitialis


  • Invades rangelands, grainfields, orchards, vineyards, cultivated crops, pastures, roadsides, and barren land
  • A single plant can produce as many as 150,000 seeds
  • Poisonous to horses
  • Adapted to a wide variety of environments
  • Ability to out-compete desirable, native plant species for nutrients and moisture
  • Plant diversity and native wildlife habitats are reduced
  • Dense stands can drastically reduce forage production and grazing capacity in rangelands
  • Cropland yields are also reduced

Other problematic invasive weeds:

Giant Reed (Arundo donax)

Salt Cedar (Tamarisk ramosissima)

Perennial Pepperweed (Lepidium latifolium)

Barbed Goat Grass (Aegilops triuncialis)

Tree of Heaven (Ailanthus altissima)

Purple Starthistle (Centaurea calcitrapa