Just a thought - I recall from the plant physiology course that I took ages
ago ;-) that it's not actually the light period that is important for
timing flowering and other events in plants, but rather the DARK period. I
know this is crucial for getting poinsettias to flower each winter on time
for the holidays. The dark period must be continuous each night with no
interuptions whatsoever for the photoperiod trigger to be successful. Just
forgetting and turning on a light for a few moments can be enough to throw
off the blooming time (I found out the hard way). I don't know if this
applies to the problem of dormancy in cps - just throwing in another idea.
Cheers,
Liane Cochran-Stafira