To be sure that the herbicide is not still active when you fert. and to be sure there is not already enough nutrients without the fert. If there are enough natural nutrients and the reason there is no bloom is the active herbicide and you dump in a bunch more fert you could have a real mess and risk a DO event when the herbicide is no longer active.

See this from the archive.

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=96127#Post96127

Last edited by ewest; 06/25/11 07:20 PM.