Competition of water hyacinth [Eichhornia crassipes (Mart). Solms] with Hydrilla verticillata Royale and Pistia stratiotes

Hydrilla verticillata can control the growth of Eichhornia crassipes to some extent when nutrients are limited, although a floating weed E. crassipes needs to anchor its roots to absorb nutrient from the bottom. Failure to do affects its growth rate. Pistia stratiotes can grow better than E. crassipes if both plants are placed in a container with limited amount of nutrient and space. It does not, however, completely suppress the growth of E. crassipes