Hydrilla (waterthyme) is a genus of aquatic plant. It is usually treated as containing just one species — Hydrilla verticillata. But some botanists divide it into several species.

The U.S. Army Corps of Engineers Buffalo District is on a mission to fight hydrilla, an aggressive plant species that has wreaked havoc from Asia to every continent except Antarctica.

Dec 5, 2025 · Hydrilla is a prohibited plant according to the USDA Noxious Weed List and the Florida Prohibited Plant List. The UF/IFAS Assessment lists Hydrilla as prohibited.

Jul 21, 2025 · Hydrilla AIS Fact Sheet Hydrilla (Hydrilla verticillata) Species at a Glance Hydrilla is a submerged, aquatic, perennial plant that grows and spreads at a very fast rate covering the surface …

Hydrilla (Hydrilla verticillata) is a freshwater plant native to Asia, Australia and parts of Africa. The species has three separate biotypes, two of which have documented reproductive strategies, and a …

Hydrilla, (Hydrilla verticillata), submerged aquatic plant that is the sole member of the genus Hydrilla in the frog’s-bit family (Hydrocharitaceae). Hydrilla is possibly native to Africa or Europe but has …

Hydrilla verticillata is a submersed, rooted aquatic plant that can grow in water up to depths of 20 ft. (6.1 m). Plants can survive in depths up to 40 ft. (12 m) in non-turbid water.

Waterthyme is an invasive rooted aquatic plant in the Hydrocharitaceae family and is native to Asia, Africa and Australia. It is the only species in the genus but many consider it to have several …

Hydrilla, a submerged perennial, is the most troublesome aquatic plant in the United States. It outcompetes native vegetation, acts as a breeding ground for mosquitoes and destroys fish and …

Jun 16, 2020 · Hydrilla verticillata is a submerged aquatic herb that is invasive in natural and anthropogenic systems. It is invasive in the United States and present in most states and in Puerto …