Milfoil (myriophyllum)

Water Chestnuts
(Trapa Natans)

Pond Lilies

Missing, above, is another very invasive weed; Cabomba Caroliniana or Fanwort (common name).The photograph and line drawing below, showing fanwort, are provided by the University of Florida. They have an excellent site for identification of invasive aquatic plants. We encourage you to visit it.

And the Mass DEM provides this picture of Fanwort. You can visit their site for diagnostic steps in analyzing what weeds you have.

ALGA

There are other problems with lakes and ponds besides submerged or emergent weeds. Perhaps you have seen something like the following in your lake or pond.

The picture shows an algal bloom. Most commonly called a scum or mat, it is actually a plant that appears when the temperature and phosphorous content of the water reach a “mutally helpful” stage. There are many types of “blooms”, only one is shown here. Their appearance indicates a water chemistry problem: mainly phosphorous, from somewhere, is contaminating the water body.

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