Pistia stratiotes

Pistia stratiotes (family Araceae) is a floating plant. Sometimes called water lettuce because of its colour and appearance. This is a very fast growing plant that demands high light and nutrients. In warmer countries like South Africa this plant can reproduce very fast in rivers dams and waterways clogging them with this weed. Pistia is commonly used in ponds to help block out light to prevent unwanted algae growth. This plant is considered a noxious weed in South Africa and other countries and may not be kept or sold here.