My plants just slowed in growth, producing few new leaves over the winter. I keep my photoperiod a natural one, but no hibernacula formed in the center of the plant.
Travis, only D. intermedia "Cuba" (reputed to be tropical) formed hibernacula. Audrey never has, although I half expected it to, so that is what you probably are thinking of from our conversation on the subject. This one seems to be a true tropical, even the seed germinates in quantity without stratification.