water hyacinth
Photo: Hiroshi Tonoshiro/Getty Images
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Pond Plants: Water Hyacinth

(Eichhornia crassipes)
Zones 9—11
A free-floating plant, it sends a 9-inch spike of lavender flowers up from a rosette of leathery, glossy green leaves. Perennial in Zones 9–11; often grown in colder climates as an annual.
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