Diane's explanation for Arnold's Arums is inspired. The trigger here must simply be the passage of time (i.e., boredom). Without pretending to understand biochemistry, it is plausible to image a growth inhibitor that could be overcome by, say, day-length or precipitation events, but will eventually wear off even without external stimuli. Best, Max > No light, no temperature differences? Obviously boredom was the > trigger. > > Diane Whitehead > From: Arnold Trachtenberg <arnold@nj.rr.com> > Subject: [pbs] What promotes blooming or growth ? > > I have to add an additional thought to the thread of flower initiation. > I have five or six pots of various Arum species on the floor of my > basement. I would say that the temperature varies little during the > year and there is no light. I turn off the HID lights that I use > during the winter for some South African species. Well, I had a look > this evening and many of the Arum are pushing up a spike of growth. So > what was the trigger in this case. > > Arnold > New Jersey