photoperiod in orchids, PLEASE COMMENT

[BruceP]

Originally Posted by Discus

Has anyone come across a fairly comprehensive list of what orchids are day-length sensitive? I'm starting to think the super-bright street lights just outside my growing area might be putting some of my plants off

There isn't one and likely never will be since nobody is going to do the experimentation on the many thousands of species that are not "commercially valuable". The best thing I could find is this HortScience article which is pretty interesting even if you don't care much about photoperiodism.

[johnblagg]

I dont do any less than 16 hours of light a day indoors ever and do know 24/7 prevents some reactions that occur only in the dark from happening regardless of wheter or not it affects blooming so 24/7 is not helpfull in the long run ....most orchids actually bloom according to dry wet season triggers which does not mean day lenght does not have a effect on some but cool hot and wet dry are the main triggers for tropical plants for sure.but tropical does not always mean equatorial ...south america is not equatorial is it? and many come from there ...

[DavidCampen]

Originally Posted by johnblagg

I dont do any less than 16 hours of light a day indoors ever ...

It would be a great service if you could list all of the orchids that you flower under these conditions . How many do you have?

[johnblagg]

lol 45 or 50 dens catts and phaius but ill see if I cant do a list of what has bloomed so far ...a lot are still too young to bloom but at least 16 have or are blooming in winter like this...including den aggeratum and den nestor and dendrobium pierardii...the last two with out a rest period as well

[Discus]

Originally Posted by BruceP

There isn't one and likely never will be since nobody is going to do the experimentation on the many thousands of species that are not "commercially valuable". The best thing I could find is this HortScience article which is pretty interesting even if you don't care much about photoperiodism.

Thanks Bruce, that is a great article.
I wasn't expecting a species by species account (I knew that was a tall order), but rather general patterns (section X of alliance Y has member Q that is short/long day). It's great that it also includes temperature info.