Keep it warm and wet (I keep it in the tray 1/3 of a pot submerged) and it will start blooming by itself.
how do I get my Utricularia sandersonii to bloom?
i have it 70f and 1/2 submerged guess its a matter of time maybe more heat
I suspect that the discussions above concern two different forms of sandersonii - white & blue. The white form has skinny ears and is possibly the most prolific blooming utric in existence. The blue form has wider ears and much less floriforous. Some people have waited over a year for the blue form to flower. Here's Bob Z's comparison pics.
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The white form is pretty easy to get to flower:
The blue form is more challenging:
Light, room temp, and adequate water worked for me.
i'm not positive of this but it appears they bloom less when they have more root room, and this depends on width of pot as well as depth