With this particular ping I have found it to be similar to Pinguicula laueana in that it likes cooler temperatures in order to trigger flowering. Others may have had a different observation, but that is what I am seeing.
Nice job, Mass.
How cold? All my Mexican pings sat on a window sill for the winter. I'd say temps got as low as 60. Not cold enough?
One thing I especially noticed about this particular Pinguicula, was how difficult it is to capture the flower with digital photography. How the flower appears in this photo, is not how it looks in real life. In reality it seems a dark velvety, purple color and texture, but the camera doesn't seem to be able to capture this.