Noxious Weeds

Invasive Plants

Details on some of the invasive noxious weeds that Contra Costa County Department of Agriculture is looking for that has been found in our county.
  • Japanese Dodder - Parasitic plant that can attach itself to most any plant and eventually kill its host. It had been found mostly in the Richmond and San Pablo areas, and a couple places in Antioch.
  • Purple Loosestrife - An introduced species found along the banks of rivers and streams. Fast spreading and it will crowd out native plants.
  • Red Sesbania - Found in riparian areas, along streams and in marshes. Fast to spread and it will crowd out natives, parts of this plant are poisonous.