What is Fanwort?

A hand holding a water plantFanwort (Cabomba caroliniana), is an aquatic invasive plant species found in submersed and floating-leaved plant communities. It has two distinctive leaf types. Fanwort’s submersed leaves are finely divided and fan-like and are attached to the stem of the plant by petioles. The submersed leaves have an opposite arrangement on the stem. Fanwort’s floating leaves are small (1 cm long) and oval to elliptical. The plant has small (1 cm in diameter) white flowers with six petals that bloom in late summer among the floating leaves. Fanwort reproduces by seed or plant fragments. It is found in acidic lakes, ponds, and streams, in three to ten feet of water.

How do we stop it?

Clean, Drain, and Dry: Always clean, drain, and dry your boat, paddle gear, and footwear after use. This prevents the transfer of organisms between water bodies.

  • Clean all plant stems and fragments and mud from boats and trailers before leaving your lake or river and dispose of them in an aquatic invasive species disposal station if one is available.
  • Empty all water from your gear well before moving to a new body of water.
  • Dispose of leftover bait in the trash, not in the water.
  • Clean out waders and wading boots before moving to a new body of water.
  • Dry your boat and gear thoroughly between water bodies by towel drying or drying in the sun for at least 5 days.

Read more about Clean, Drain, and Dry requirements and best practices at the following websites:

Northern Forest Canoe Trail
Lake Champlain Basin Program

If You See It, Report It

You can report Brazilian Elodea sightings through the iMapInvasives website, the iMapInvasives mobile app, or by contacting the Adirondack Park Invasive Plant Program (APIPP).

Volunteer with ADK

You can help ADK survey ponds and lakes for aquatic invasive species such as Yellow Floating Heart, European frog-bit, European Water Chestnut, and Curly Leaf Pond Weed. For more information on the Backcountry Water Monitors Project and upcoming workshops and outings, please visit our website.


Learn More About Fanwort (sources for description above)




Please also see all invasive species of concern for the Adirondack Park: http://adkinvasives.com/species_of_concern/