Eichhornia azurea

Common Name: rooted water-hyacinth

Family: Pontederiaceae

Common Synonyms: none

USDA Hardiness Zone: 9B - 11

Growth Habit: Rooted aquatic

Origin: Central and South America

FISC Category: -

FDACS Listed Noxious Weed: Yes

Introduction Date: introduced in US in 1800's, unknown when introduced in Florida

IFAS Assessment:

North: Not Assessed
Central: Not Assessed
South: Not Assessed

Eichhornia azurea — Kurt Stueber, Max-Planck-Institute for Plant Breeding Research, Cologne, Bugwood.org

Description

Rooted perennial aquatic. Leaves alternate, submersed leaves sessile, emersed leaves stalked, the stalk not inflated. Showy purple flowers above water surface on erect stems, 7-50 flowers per stalk. Flowers summer through fall.

Habitat

Coastal rivers and lakes

Comments

Only vouchered from Columbia Co, but is a Federal Noxious Weed. Good to prevent establishment.

Control Methods

Manual: Mechanical: Chopping (Texas State University)
Chemical: Likely can treat similar to E. crassipes (water hyacinth) as follows: Foliar (diquat dibromide, 1-2 quarts/acre smaller plants, up to 3 qt/ac for mature plants). Frequent applications may be required. [IFAS]
Biological: NA

Control Notes

**Follow herbicide labels: Only herbicides registered for application in water by EPA and FDACS may be applied to weeds growing in or near water.

References

Dave's Garden. 2013. PlantFiles: Anchored water hyacinth, peacock hyacinth, Eichhornia azurea. http://davesgarden.com/guides/pf/go/32226/. Accessed on December 9, 2013.

Texas State University - Institute for the Study of Invasive Species. 2013. Eichhornia azurea, Anchored water hyacinth. http://www.tsusinvasives.org/database/anchored-water-hyacinth.html. Accessed on December 9, 2013.

University of Georgia - Center for Invasive Species and Ecosystem Health. 2013. BugwoodWiki: Eichhornia azurea. http://wiki.bugwood.org/Eichhornia_azurea. Accessed on December 9, 2013.

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