Weed Identification


Welcome to SePRO's Aquatic Weed Identification Guide. This guide will serve as your first step toward identifying and managing your aquatic weed problem. To get started, click on whichever group of aquatic weeds to which you feel your problem weed belongs and work through the examples until you find it.



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Cabomba caroliniana

Fanwort is a submersed, floating plant with short rhizomes. The shoots are grass green to olive green or sometimes reddish brown. The leaves are either submersed or floating; submersed leaves are finely divided and arranged in opposite pairs on the stem. Floating leaves are small and inconspicuous. The floating leaves are less than 1/2 inch long and 1/3 inch wide. The leaf blade attaches to the center. The flowers are white and small and float on the water surface.

Also known as: Cabomba; Cabomba Carolina

Filamentous Algae

Spirogyra; Cladophora

Also known as “pond scum” or “moss,” this type of algae can form dense, hair-like mats on the water’s surface. If left untreated, the mats can cover the entire surface of the pond. There are many species of filamentous algae and often more than one species will be present at the same time in the pond.

Also known as: Scum; water net; frog spittle; moss

Flat-Stemmed Pondweed

Potamogeton zosteriformis

Flat-stemmed pondweed has a large stem and is flattened. The leaves are ribbon-like.

Also known as: - No listed alias -

Floating-Leaf Pondweed

Potamogeton natans

Floating-leaf pondweed has both floating and submersed leaves. The floating leaves are heart-shaped while the submersed are long and narrow.

Also known as: None known