I have, as set out in earlier posts, six potted Strelitzia Reginae that are doing very well. Of course they would not survive a Vancouver winter outdoors so they go into my tiny greenhouse each fall. I try to keep it as cool as possible - I have some hanging cacti there too - and the temperature never exceeds 60F. Most of the time it is around 55-60F. That is during the daytime; I don't know what it is at 4 am but I suspect that it is closer to 50F. It is well-lit. My problem is the exact opposite of many peoples': they love the greenhouse's environment so much that they bloom very early. They are about to start blooming within the next few weeks. Unfortunately they have a fairly short blooming time and so they will have finished blooming by the time the weather is warm enough for me to put them outside for everyone else to see. (In fact one of my cacti is about to bloom - but that will be for a later post, I guess.) I would love to prevent them from blooming so early. Failing that, I would love to extend their blooming period. But I do not know how to achieve either result. Does anyone have any suggestions?