Pygmy Drosera dying?

[Kosh]

For the past two years I have been growing Drosera paleacea indoors under bright LEDs. I have been periodically adjusting the photoperiod to mimic seasonal light fluctuations and they are kept in standing water. It has been amazing getting gemmae from these plants and quickly going from two to twenty plants over a single growing season. About two months ago the 2nd generation plants started producing gemmae for the first time. Oddly, they have continued to produce new gemmae after harvesting all of their original batch. I've noticed that most of these plants have died by now, with their few remaining underdeveloped gemmae turning brown with the rest of the plant. I'm not too concerned with the adult plants dying, as I now have too many gemmae than I know what to do with even after sowing the next generation. I'm just curious as to why my adult pygmies are dying after their first gemmae production. Are they simply producing so many gemmae that it drains the plant of too much energy? Is it normal for them to act as annuals when grown using seasonal photoperiods? Do they require a dormancy period (perhaps initiated by drought) in order to grow for multiple years?

Thanks for any insight!   

[nimbulan]

While it is strange for the plants to die after just a year, pygmy sundews do have a limited lifespan and it's normal to lose a few plants each year. Dormancy is considered difficult and unnecessary.