> Also, my guess is that it's caused by severe weather changes ... both times
> I've observed it (NC VFT and the above-mentioned Drosera) it has been
> following extremely cold winters, or cooler-than normal springs ... would
> this weather interfere with seed production, and therefore induce the
plant
> to try vegetative reproduction as an alternative?
>
D. Schnell mentions in his book _CPof the US and Canada_ (1976) states that
severe temp. fluctuations is the cause of this.
Christoph