Purple petioles? Deficiency?

Hello I am curious about plants having purple petioles. I know that some plants genetically have purple leaves stem etc and witnessed this before. I think this is a deficiency because it is occuring to almost all the strains I have grown.
It always starts where the petiole joins the leaf and then travels towards the stem on the plant. Affects the older shade leaves first and eventually the stem of the plant normally in verticle lines. Eventually on leaves that have had purple petioles for a few weeks the veins begin to turn purple/red travelling away from the base of the leaf.
It is only ever the top half of the petiole.
pH is 7.

P.S Im aware that there is some white spot damaged on those leaves from spidermites, predators are on their way

Any ideas help would be appreciated thankyou.



I had the exact same. Cured it with 2tbsp per gal of Epsom salts.

The red streaks in the stems stopped immediately and the petriols all turned green.

I believe a lack of sulphur was to blame. Makes sense due to your medium being ph7.

It can quite often be magnesium.
Magnesium's purple stems. Usually does start at the petiole, then progresses down.
Cold weather knocks magnesium around as well.
Deficiency or toxicity, only really you will know.
Though, since its been progressing slowly, it may just be a little deficient.
In which @Nutty sKunK has the perfect solution, of feeding some ebsom salts.
Good luck mate.