Astronuc said:
I think plants do need a cycle of light and dark. That is the evironment to which plants below the polar (arctic and antarctic) circles have adapted.
IIRC, from biology (~35 years ago) there is a light and a dark phase in plant metabolism, i.e. plants have circadian rythms just as animals do, and plant hormones are affected by them. I seem to recall a 'dark' photosynthesis, but offhand I don't remember the details.
It would make for an interesting experiment as turbo indicated.
We need an herbologist here.
Well, this is the plan that most grower's relate to me (I've learned through word of mouth and online web pages, and there seems to be a concensus:)
The general method is to start out on 24 hour light cycle (basically, always light) to promote leaf growth, and then at some point, you start cutting in dark hours, like 2 at first, then 4, then 6. According to most claims, the ideal situation is that you get it down to 12 light / 12 dark by the time you want your plants to bud.
I've actually heard that for the 12/12 budding cycle, for the best results, not a single photon should hit your plant leaves during it's 12 hours of darkness. I have a friend that uses a spectrometer to make sure (i mean, realistically, I'm sure plenty of photons hit the plant, but its about reducing the numbers as much as you can).
Of course, as well, most of you who garden would know the three numbers on most nutrient packs you by stand for:
roots-bloom-leaves, which I believe represent the nutrients:
nitrogen-potassium-phosphorus
So the majority of nutrients that you give your plants should represent the cycle or phase they're currently in. So, obviously, you want high-nitrogen when they first start out, to ensure a good root system, and then high potassium when they're growing, so they get lots of leaves. The more leaf surface area, the better they can photosynthensize, which leads to the final phase, blooming/budding where you want more phosphorus.