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A perennial submersed plant introduced from Brazil. Often sold as an aquarium plant despite its invasiveness.
Most rooted and free-floating submersed weeds in ponds are readily controlled with triploid grass carp; control may be poorer on the watermilfoils, particularly Eurasian waterfoil.
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A rooted plant, but can often be found broken off from the mother plant and floating. Highly invasive, and should be monitored closely.
Linear and soft to the touch with very fine serrations on the leaf edge. The middle and upper leaves are usually found in whorls of four to six (although this can vary and is not a reliable identifying factor by itself).
Delicate, and borne upon long petioles. The petals are white, and the centers are yellow. Flowers appear on the surface of the water during the bloom season (mid-late summer).
Circular in cross-section and slender.
Egeria and hydrilla can easily be confused. Egeria is more robust, and the stem is smooth and soft to the touch. Both have leaf serrations (but on Egeria they are very small and require a hand lens) and feel soft and smooth when drawn through the hand. Hydrilla leaf serrations are easily seen with the naked eye. Egeria stays green all winter, while hydrilla will die back during the winter in the Carolinas.
Whether you're a professional botanist or a casual nature enthusiast, the NC State University (NCSU) Aquatic Weeds app has detailed information on a wide variety of aquatic weeds to assist in identification.
Please read these instructions before downloading the software:
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