Its been a long time, but I seem to remember the aponogetons I had (crispus and ulvaceus) at least went into short hibernation, they died back till just a few buds on the bulb every now and again. I usually pulled them up and cut off everything (roots, dead leaves). Then I'd replant the bulb (very shallow or just anchored, not deep in soil or it would rot) and then leave it, most of the time it would come back this way after a few weeks/months, but it was just me doing 'something' that seemed right, and not based on any factual knowledge (as the internet was not yet in my life at the time), all I had was the sellers information to not let the bulbs rot during dormancy, no clues on how. I'm sure you can find better info now. All I know is that its important to not let the bulb rot. Ulvaceus was always stronger then crispus for me, the latter rotted a few times regardles, but usually after a few hibarnations. Ulvaceus rarely rotted, and when it did I could usually cut off the bad part from the bulb and it would recover. I'm curious to read new insights from pro's here to see if my treatment of this plant in the past was detrimental or lucky
