The Water Hyacinth (Pontederia crassipes) originated in the Amazon Basin but has since been introduced around the world, for better or worse.
While beautiful (and in some cases, useful) this species has amazing regenerating super powers: not only is it one of the fastest growing plants on the planet (up to 16 feet in a day), it can also spread by stolons as well as by seed. All of which make control or eradication near impossible.
This rapid reproduction means the species can quickly cover a body of water, disrupting an entire ecosystem. On the plus side, they excel at removing heavy metals from waterways which can be helpful in a water treatment system. The stems are fibrous and can be woven into a multitude of useful items.
Looks like Floridians better start learning to weave!