Water hyacinth is a free-floating aquatic plant that is native to tropical South America. It has broad, thick leaves. A single stalk rises above the surface and holds 8-15 purple flowers. It is most common in the southern US but is sold as ornamental plants all around the country. Water hyacinth reproduces very quickly by runners and seeds and it can easily cover the whole surface of the water. This will deprive the water of oxygen and disrupt water flow. It can be controlled using a 2,4 D, Diquat, or Glyphosate herbicide. Water hyacinth is known for its ability to take heavy metals out of the water. Currently, in some eastern countries, it is being used as a water purifier to remove arsenic from drinking water.
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