Stems can be more than 35 feet long. This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. This species is often rooted, although it can break loose and form a free-floating state (Langeland 1996). Hydrilla closely resembles two other aquatic plants found in Washington: The non-native plant Brazilian elodea – Egeria densa and the native plant American waterweed – Elodea canadensis. Major colonies of hydrilla can alter the physical and chemical characteristics of lakes: Hydrilla has mid rib teeth that causes the plant to feel rough when drawn through your hand, also you may want to go to Texas A&M AgriLife Aquaplant website for more info and identification pictures and explanations. Hydrilla is an aquatic plant native to Asia, Africa, and Australia. It has long stems that branch at the surface where growth becomes horizontal and dense mats form. An invasive aquatic plant recently found in several counties, hydrilla could impact New York’s fishing, boating, swimming, and waterfront property values. Hydrilla is able to dominate a body of water rapidly through its photosynthetic characteristics (Van, Haller, and Bowes 1976; et al. The plant’s aggressive growth (hydrilla’s 20 – 30 foot stems can add up to an inch per day) can spread into shallow water areas and form thick mats that block sunlight to native plants below, effectively displacing the native vegetation of a waterbody. …an immensely accomplished artist with a huge sound and a way of playing that is lyrical and intense without a hint of preciousness. often forming impenetrable mats of vegetation. Hydrilla (waterthyme) is a genus of aquatic plant, usually treated as containing just one species, Hydrilla verticillata, though some botanists divide it into several species.It is native to the cool and warm waters of the Old World in Asia, Africa and Australia, with a sparse, scattered distribution; in Australia from Northern Territory, Queensland, and New South Wales. 2. FACT: Stems of hydrilla may grow up to 30 feet long. Hydrilla once was used as an aquarium plant, and has become a weed of economic importance. Characteristics very similar to the American waterweed (E. canadensis) The following website contains photos and descriptions of hydrilla and similar species: Nonnative Fresh Water Plant: Hydrocharitaceae- Washington State Department of Ecology Hydrilla: Hydrilla verticillata Appearance: Hydrilla is a submersed, much-branched, perennial herb, usually rooted but frequently with fragments seen drifting in the water. Identification: Hydrilla verticillata . It is a tenacious weed that has several ways to propagate: seeds, plant fragments, tubers, and turions (a type of bud). Colle and Shireman (1980) found reduced weight and size in sportfish when hydrilla occupied the majority of the water column, suggesting that foraging efficiency was reduced … Hydrilla generally grows rooted into substrate, but the plant is easily fragmented and it will also survive as a free floating mat at the water surface. -The Sunday Times- 1977), combined with several very efficient methods of vegetative reproduc­ tion, i.e., through runners over the surface of bottom muds and through Hydrilla has been shown to alter the physical and chemical characteristics of lakes. is a submersed perennial monocotyledon plant from southeast Asia (Cronk and Fennessy 2001). Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S. Long story short, it and any aquatic plant would make good compost, just know what you are dealing with. 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