plant is at 5 weeks and a couple days ago i noticed the branches turning purple and start decending to the bottm of the main stem. nutrients, light cycle, ph, and moisture are fine. should i give it more nitrogen?

nope, if your leaves are emerald green, you have no nitrogen defficiency. sounds more like a phosphorous deff to me, perhaps due to a lockout.

what nutes are you using? does it include micro nutes? if not, you may be seeing the beginnings of a molybdenum deff.

No don't give it any Nitrogen, purple stems is not an indication of Nitrogen deficiency.

If the plant is deficient in anything it will be Phosphorus as purple stems 'can be' an indication of Phosphorus deficiency, but it's highly unlikely to be this after only 5 weeks and a couple of days old.

Purple stems is also a 'genetic' trait in many Cannabis varieties and is nothing to worry about, my plants in my last grow all had purple stems and it wasn't deficient in Phosphorus.

Purple stems can also be an indicator that the lights off temperature is too cold compared to the lights on temperature. Lights off temp shouldn't fall below about 60 degrees F.

Monitor the situation and watch the leaf colours - if they start changing colour then its possible it's deficient in P, but what I can tell you with 99% confidence is that's it is not deficient in Molybendum - Cannabis plants rarely ever suffer Molybendum deficiency and it's the rarest of the nutrients to be found deficient in Cannabis plants - the plants simply don't use enough of it to become deficient in that nutrient.

using a fert a little higher in phos than everything else and plant looks perfectly healthy to me, leaves are bright green...it probably gets to 65 deg. in my closet at night at the least

true on molybdenum; sounds more like p. however, i don't agree with the statement on phos. i beleive that's exactly what is wrong, as even strains with genetically purple stems do not show much more than purple freckles if fed properly. if you notice any yellowing at the veins of the leaves, feed with a flower fert once, and switch back. that should provide enough phosphorous to the plant until you flower... after the first few weeks of flower, you'll be feeding with higher p and k values anyway.

imo, it's nothing to seriously worry about.

hope that helps put you at ease.

edit, i just saw your post. stop feeding with high p, you have a lockout.

alright, thanks for the help

Then we'll have to agree to disagree. There's plenty of plants that have genetic purple stems and they're purple not freckled - I had some on my last grow and they were not deficient in Phosphorus as I've already stated. They have purple stems for exactly the same reason that some varieties in flower produce purple buds - and they're not deficient in P either.

If his ph is within the correct range as he stated in his original post, how does he have a lockout? Are you now saying that the P deficiency is being caused by over-feeding?

The only way his plant can be P deficient is if his ph is out of whack and that's whats causing the lockout. Too much P from over-feeding does not produce purple stems.

It's either a Phosphorous deficiency or it isn't and I think you need to make up your mind which it is.

I agree with baby, Im growing purple widow right now, and stems turned purple. Check gallery. But when it was younger stem was purple. You have nothing to worry about man. Grow on : )

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The only difference between what your doing and what im doing is, im doing it right.

most times, when fertilizers are overused, a salt buildup occurs, which alters the soil ph, and causes lockouts. i have seen this most with bloom nutes. over using p resulting in a lockout of p. a defficiency caused by nutrient lockout.

hi all
my babies are doing great I have journaled the whole thing and I have it down to trial and error science,,,,,,,,,,,,,,,w00t