I produced gemmae from d. pulchella and nitidula x ericksoniae by decreasing the photo period by one hour every week from a thirteen hour period to eight 1/2 hour period. Gemmae were produced about... two weeks after 8 1/2 hour photo period was reached? Cant... re...member... Its been a while. All plants are grown under lights, with no temperature fluctuations. Average temperature is 72 degrees Fahrenheit.