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.

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 …

Dec 5, 2025 · Hydrilla has widescale impacts in Florida waters and is highly adaptable to a variety of growing conditions. It can grow in almost any freshwater system including springs, lakes, marshes, …

Jul 21, 2025 · Hydrilla is a submerged, aquatic, perennial plant that grows and spreads at a very fast rate covering the surface of water bodies and restricting boating, fishing, swimming, and other …

3 days ago · Hydrilla verticillata can grow quickly in waters with a limited supply of light, carbon, nitrogen, and phosphorus. It can start photosynthesis earlier in the morning than other plants, and as …

Description: Hydrilla, sometimes called water thyme, is a submersed, non-native, perennial aquatic plant in the Hydrocharitaceae family. Long stems contain many whorls of 4-8 short leaves, and tend to be …

Jul 5, 2024 · Hydrilla has long slender stems that can grow underwater to lengths of up to 25 feet. Its identifying characteristics are displayed to the right. Hydrilla is easily confused with a native water …

Hydrilla forms dense mats of vegetation that quickly outcompete native species for habitat, as well as make navigating waterways difficult for boats and aquatic species. Known as one of the most …

Hydrilla can grow an inch or more per day and can be found in water only a few inches deep to the deepest parts of Florida's lakes and rivers. In Florida, hydrilla produces dense canopies covering …