.......... it's because a hibernaculum forms above surface and so would lose the water it is trying to retain during a drought.
Looks like it. I did some (very) quick googling and it appears that it has an optional dry, summer dormancy. Thanks, corky.D.hilaris?
That's not so convincing an argument when I look at the hibernacula on my temperate Pinguicula or should I say I look at the hole where the hibernacula are buried below the surface.
Pygmy sundews are (sub)tropical, but generally have a drier summer dormancy period. It's not necessary for all species, in particular Drosera scorpioides will grow year-round.
I've heard that as well, but I was under the impression that most species will go dormant whether you want them to or not. I could be wrong, I'm not really a pygmy grower.I've heard that you should always try to avoid this dormancy, as sometimes it can be hard to bring them back out alive. Do you know the species that would want the dry dormancy?