Feb 1, 2013

Revised "Weeds Watch Out!" invasive plant identification guide now available.

Although targeted to the Oswego River Basin region, this guide to the identification of aquatic invasive plant has great utility for any area of the Northeast or Great Lakes regions. Most of the plants are shown as both colored photographs and black and white line art and many are also accompanied by descriptions and illustrations of non-invasive native look-alikes. Vegetation addressed includes:

  • European frogbit (Hydrocharis morsus-ranae)
  • Water chestnut (Trapa natans)
  • Hydrilla (Hydrilla verticillata)
  • Brazilian waterweed (Egeria densa)
  • Curly-leaved pondweed (Potamogeton crispus)
  • Starry stonewort (Nitellopsis obtusa)
  • Eurasian watermilfoil (Myriophyllum spicatum)
  • Fanwort (Cabomba caroliniana)
  • Parrotfeather (Myriophyllum aquaticum)


Click here to download the Guide. (15 MB file)


Prepared by the Weeds Watch Out! (W2O!) program, the Guide is a very handy reference tool for lay audience use in identifying and understanding invasive aquatic plants in the Great Lakes and Northeast regions.

Weeds Watch Out! is an education and outreach program that will help to control the spread of invasive aquatic plant species into, within, and from the Oswego River Basin, a sub-basin of Lake Ontario. W2O! has established strong inter-watershed relationships in the Oswego River Basin to effectively address current and future invasive aquatic plant issues in a coordinated manner. For more information, visit the web at www.co.cayuga.ny.us/wqma/weedswatchout/.

W2O! was funded by the Environmental Protection Agency (E.P.A) Great Lakes Grants Program, E.P.A. Great Lakes National Program Office, and the National Fish and Wildlife Foundation.

Collaborators on the project are:

  • Cornell Cooperative Extension Associations of Cayuga and Onondaga Counties
  • Cayuga Lake Watershed Network
  • Finger Lakes Institute at Hobart and William Smith Colleges
  • Cayuga County Planning & Development
  • Oswego County Soil & Water Conservation District


W2O Cover