Wow!! I have this plant! Thanks for posting because I spent a good week googling it without any success. I found it growing near a drain, submersed under cold water along with some of Gomer's mini-pearly moss. Took both home and they're still doing fine. I hope they'll last.
Amazing how luck turns out sometimes! Glad I could, er.. help.
It says if you keep it fully immersed it should go beyond being seasonal. Also, there is no winter in your tank, and it's an outdoor N. American water plant, so I am sure the changing light and temp affects it's life. Those prolly aren't happening much in your tank
Let me know how it does, send us some pics, and hopefully I'll get to buy some from ya!
I'am a french master degrees student actually working on a protection projet about Subularia aquatica (which is endangered in France) led by the "Nationnal parc of Pyrénées" and by the "Midi-pyrénées botanic conservatory".
I saw that you had (in 2005) this plant in culture in aquarium. I would like to know if you success in breeding this plant (flowering, reproducing, producing seed, ...), and if it does, what were the maintains parameters ?