See if you think this link is the plant.

http://aquaplant.tamu.edu/plant-identification/alphabetical-index/water-primrose/

I am not sure you have an alkalinity problem. The swing you reported with rain is not that big. Is there anyone around you with a pond that you could test against?

Those look like BG beds.

Last edited by ewest; 07/06/16 10:57 AM.