Hawaii's Most Invasive Horticultural Plants

   
hydrilla
Hydrilla verticillata

(Photo credit: Victor Ramey)


Other names:water thyme, Florida elodea
Description: Underwater herb with stems 1-20' long; small, oblong leaves with toothed margins, in whorls of 4-8 at stem joints; inconspicuous flowers; and fruits not formed.
Risk areas: Freshwater lakes, ponds, ditches, canals, marshes, and slow-moving streams.
WARNING:Arrives in Hawaii as a contaminant with other aquatic ornamentals. Capable of forming dense mats that choke water bodies, this plant does not form seeds but proliferates by vegetative growth.

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