greenspace
Amazing what kind of difference one week can make:
The water hyacinth, Eichhornia crassipes, was originally introduced to Florida's waterways to act as a natural biological filter, extracting pollutants and impurities from its waters. It was a successful plan, but perhaps too successful - without any natural predators, the hyacinth has since grown out of control. In certain moving bodies of water, manatees keep it in check, but in stagnant or enclosed bodies of water, it eventually covers the whole surface of the lake, choking off any and all sunlight to other plants.