Aponogetons may never die off, depending on the species (undulatus or crispus is what you find in these pkgs.). You can pollenate them yourself with a makeup brush but fish will eat the seeds. Very easy undemanding plant to grow.
For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow.
Member of the AGA (Aquatic Gardner's Association)
Member of the IBC (International Betta Congress)