Why would a water hyacinth need fertilizer? Mine grow like crazy just from the
fish waste. Unless you don't have fish they shouldn't need any help.

Moon
remove nospam from e-mail to send to me, I grow trees in aquariums like bonsai.
I breed dwarf crayfish, great for planted community tanks. If you can get me a
shovelnose sturgeon fingerling (Scaphirhynchus platorynchus) no wild caught
please, contact me