Hi all,
It could be etiolation, but I very much doubt that they would develop that while in the post.
No, I reckon that is at least 2 weeks in the dark.
Nearly all insectivorous plants come from nitrogen poor environments, that is why they have to resort to getting animal protein for their N fix. Generally the problems you get plants from resource poor environments is that they are evolved to be very efficient at "grabbing" cations and anions as they become available. If you then place them in a situation where these nutrients are available you get luxury uptake, which disrupts the organisms metabolism, and often leads to death. In terrestrial plants
Protea, Banksia etc. are a great example of this, they come from very phosphorus (P) poor soils and have huge root systems with mycorrhiza etc. if you put them in an environment with normal levels of P, it is rapidly toxic. I'm not sure with
Utricularia as it is a funny plant, even for an insectivorous plant, as all their "roots" and "leaves" are probably modified stems.
cheers Darrel