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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: Betsy Gagne) |
| Description: | Colonial, floating freshwater fern with 1/4-1.5" round or elliptic, hairy surface leaves and root-like submerged leaves. |
| Risk areas: | Lakes, ponds, ditches, canals, marshes, and 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. |