This species is abit of a weed here and regularly invades nepenthes and utric pots in the greenhouse for me, it spreads particularly well by roots which can run along a bench for a few centimetres then send a plant out.
And leaf cuttings in pure water produce many plantlets, on average I find that a single 15cm long leaf left in pure H20 will make anywhere from 20-30 plantlets, sometimes more, they literally spring out touching each other.
They also spread faster in certain substrates (like most carns) for example I find that in pure sand or peat mixes they spread fast but make smaller plants, but in mosses (leucobryum or spag) they spread less but make much larger plants.
I should also add that it lives here, hence my conditions in my greenhouse are more than perfect as they are like a permanent wet summer, so the dry that would normally effect them doesn't.