Anchored Water Hyacinth

Pontederia azurea

Other Common Names

Rooted Water Hyacinth

Plant Category

Aquatic, Perennial

Invasive Description

Native to Central and South America, the Anchored Water Hyacinth was first introduced to the United States through New Orleans in the late 1800s. This plant became well established by the 1990s due to high use for ornamentation in private ponds and pools. Anchored Water Hyacinth is typically rooted in mud. Its vegetative stems elongate and develop to and grow at the water surface. The plant has distinct leaves that are round, glossy, and green measuring 10 m in diameter. This plant produces large flowers that are blue or purple with yellow markings similar to lilacs. Synonym: Eichhornia azurea

Ecological Threat

Anchored Water Hyacinth forms dense water beds weighing nearly 200 tons per acre when healthy. The mats lower light penetration and dissolved oxygen levels, killing off native aquatic plants and affecting fish communities. The plant serves as a vector for disease by providing a habitat for mosquitoes and parasitic flatworms. The mats can impede boat traffic, and clog irrigation canals and intake pumps. The Hyacinth spreads easily when pieces of the flower mat break off from wind, current, or animal feeding and are transported to a new location where they take root.

Anchored Water Hyacinth (listed under Eichhornia azurea) is on the Texas Dept. of Agriculture’s List of Noxious Plants and on Texas Parks and Wildlife’s list of Invasive, Prohibited and Exotic species which are illegal to sell, distribute or import into Texas.

How to Eradicate

For information on how to eradicate this invasive, view our statement on herbicide use and preferred alternatives for invasive plants.

Native Alternatives

You can replace this invasive plant with native alternatives. Here are some plants that make superior replacements.

Match your location on the Texas map to the color squares on the replacement plants below to find suitable replacements for your ecoregion.

Click for more details about the ecoregions
Additional Replacement Options: Humped bladderwort (Utricularia gibba), American white waterlily (Nymphaea odorata)