Invasive plant
2 Responses
The plant is an induced invasive water plant called "Alligator Weed". It is difficult to control, but there are some useful herbicides. I will give you some references about controlling it below.
http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-1836/SRAC-361weblinks.pdf
http://aquaplant.tamu.edu/management-options/alligator-weed/
http://wric.ucdavis.edu/information/natural%20areas/wr_A/Alternanthera.pdf
Thank you. I will try the product