Sativa droopy cant seem to find the answer HELP please ..

HI im growing urban pioson from nirvana the my plant seems verry droopy the bottom isnt as bad as the two tops im growing in biocanna turra plus and useing biocanna ferts .

my fan isnt blowing directly on the plant temps are 75 lights on and 65 off humid 45%
ive got a 400w hps and a 150w cfl all i can think of is eather the ph or root bound any help and advise would be apreciated .
thanks in advance

how often r u watering looks to me like its overwatering.... anyone else got any opinions?

i just say because i have two sativas flourishin in 3 gal pots 8 weeks into flower at 7ft plus had to lst them late

is it getting enough ventilation ?.

it could be that they are rootbound. what size pots are they in?

rootbound is a possibility, however overwatering is most likely the problem, when a plants roots are not receiving enough, or to much nutrients the plans will droop. especially the lower leafs of the plant

i decided overwatering even before i saw the pics. lift the pot, get used to the weight. then water accordingly. I let them get fairly light before water.

i waterd last nite (pot was pretty light) gave her 2lts of water?
think its a 5gal pot i i replanted her 21 days ago and i did spot some roots at the drainige holes ?
i usualy water every 3rd day and ive got clay balls mixed into the soil and te bottom.
Oh and the stems are purpl bottom leaves are yellowing ?
Thanks for the input guys

I believe you are experiencing 3 different issues here:

Drooping from overwatering.
Purple stems from too large of a temperature difference in your day/night cycle.
Bottom leaves yellowing, which is normal for flowering.

I honestly wouldn't worry too much about the bottom leaves yellowing (it happens). Just try to keep your temps in check and don't over water.

cheers ill back off a bit with the water . ive been flowering for about 2-3 wks but no sighn of buds forming yet ? is that normall? what can i do to combat the virticle grow ?