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Hawaii's Most Invasive Horticultural Plants |
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Hawaii's Most Invasive Horticultural Plants |
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 (Photo credit: Gerald D. Carr) |
| Description: | Free-floating herb with basal rosette of leathery 2-6" leaves having swollen, inflated bases and an erect stalk of 1.5" lavender flowers. |
| Risk areas: | Freshwater lakes, ponds, marshes, ditches, canals, slow-moving streams. |
| WARNING: | One of the two worst aquatic weeds in the world. Colonies develop in such numbers by vegetative spread that still waters can be covered with a continuous carpet of plants. |