Leaves turning purple

[Franzkafka]

One month old clone. No nuts so far. PH and temp are regulated. Some leaves especially the older ones started turning hard and dark purplish. Your thoughts pls.

[ShimmyBob]

I've only been at this for 9 months or so, but the plant looks healthy otherwise. Are you experiencing any other problems besides the weird discoloration? Could just be some random mutation that only expresses itself at a certain PH range or something.

[Franzkafka]

The pH was high the first 2 weeks around 7 then I lowered it around 6.2-6.3. And yeah it looks healthy otherwise. I am afraid the discoloration will turn into wilting and drying. Most people I asked say phosphorus Def or low temp but the temp is where it should be.

[alltatup]

Looks like she needs to be transplanted into a larger pot.

[Franzkafka]

As far as genetics I doubt it. I have seen the same clones in veg having green stans and leafs my steams are also purple or dark red