Methods of Introduction
The plant originated in southeast Brazil and was exported as part of the pet industry to be used in aquariums and garden ponds. From there it escaped or was deliberately released into the wild. It is possible that it may also have been brought in with fresh, iced fish. Once in a waterway it can be spread by infested boats which not only spread it to new areas but also break the plant up which allows it to propagate. It also is spread by waterflow.
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