Any Idea?

First time with this problem. She is a Jack herer clone mother. The problem just started within 2 days. 1 foot under aircooled 400 watt Mh on 18/6 light schedule. What is the diagnosis guys? Oh btw just started using AN Jungle juice so that could be causing problems... Thanks for any input!! Fyi she is drooping due to recent watering.

Nutrient burn,was the plant ok before using the jj,have they out grown the pot's there in.

Look's like you have a problem with the up take,i have been growing jack herer now for around 12 year my mother is around 5/6 year old of it,that is a clone only jack.But i have seen the purple before on jack herer ,but its normally just streaking not full blown purple stem's.This to me say's it need's more feed.If the plant was fine before the jungle juice was added,then either leave it out,or use 1/4 the amount you used last time

Not looking at the "old damage" - @cjishigh

Look at the new growth at the very top.
Your getting an increasing micro nutrient def, Iron and Sulfur are easy to see.. Mg looks low too! Even the growth at the first cpl of nodes below the main are showing it.

Get some Kelp extract and add that and I might be inclined to add a tsp of Epsom salts to the feeding once too. (keep using the Kelp extract) I might go directly to a foliar application of just the kelp and the Epsom....1tsp of each in a gallon and spray thoroughly !

See how this works. I might increase my nutrient containing highest N concentration a bit too...

Good luck

P.S. Just looked at it again.....The older damage reminds me of a pH based issue and the problem is kinda hovering around still, possibly..

What do you feed and what do you add to the feed?
What is the media, soil - hydro?
What do you pH your in going or res to?