Do seedlings need dark periods?

Originally Posted by resinousflowers

2the plants do some important things during the dark period.

Like what?

Originally Posted by resinousflowers

24 hours for the first week,then 20/4 or 18/6 after that.the dark period is important.the plants do some important things during the dark period.
this is the reason why plants tend to look more vibrant if they have some dark time.but you can get away with 24/0 throughout the whole of veg.

Everything that happens in the dark (in C3 plants like cannabis) happens during the light as well. Since they only take up carbon (CO2) while there is light, they will have more growth with 24/7 light.

I dont know why the myth of cannabis needing a dark phase is perpetuated so much on this site, but trust me, as a biologist, the science just does not support it.

True that Dogg !!!!! Growing is a personal thing. I know a guy who SWEARS that his 21:45 light/2:15 dark schedule produces a better and bigger bud......whatever.........

I've tried both and the only difference I've found is that my plants get tighter inter node spacing on 24/0 than on 18/6.

Originally Posted by RIPLouDogg

Nope. Totally wrong. The evidence supports the contrary.

interesting, though I never claimed the way I was doing it was right. People have done 18/6 vs. 24/0 grows and shown results where the 18/6 has done better. I'm not saying you or the evidence is wrong, just that in a practical application people seem to dispute the evidence somewhat.