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Hawaii's Most Invasive Horticultural Plants |
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![]() (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. |