American Spongeplant

Limnobium spongia

American Spongeplant

Family: Hydrocharitaceae

Weed class: noClass
Year Listed: 2021
Native to: Southeastern United States,

Why Is It a Noxious Weed?

This plant is not listed on the Washington State Noxious Weed List but is listed on the Washington State Prohibited Plants/Quarantine List. For questions about the quarantine list, contact the Washington State Department of Agriculture's Plant Services Program at (360) 902-1874 or email

How would I identify it?

Additional Photos