An update from me, I've got scorps full of gemmae already. It was always February previously, and I can tell you exactly why - I used to use a 12-16 hour photoperiod depending on the time of the year, and this year I dropped it down to 10-14 to more closely match what most subtropical plants experience in their natural habitat. The lower photoperiod triggers gemmae production, so the plants were doing it out of season when the photoperiod wasn't dropping low enough. Maybe I'll even get some flowers this time around!