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At least 65 pondweed species are present in the U.S. All are perennial aquatic herbs with stipules at each leaf. Many species have both submersed and floating leaves. Leaves are typically alternate, although some may be sub-opposite and appear opposite. Introduced from Europe. May grow in up to 15 ft of water. Propagules germinate in fall, overwinter, and resume active growth in early spring before most other submersed plants.
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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Can form large, dense infestations, especially in cooler climates. Tolerant of brackish water.
Submersed and alternate, with wavy, sharply toothed leaf margins.
Forms rhizomes and stolons.
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.
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