Early on in their life I posted pics of my then red stemmed Yellow Scorpion Cardi seedlings. I have kept track of them and now one is starting to set pods. The stems have turned dark purple. They are missing nothing food wise, get the same treatment as all the other plants but continue to be different. The seeds were from a very reliable source, were not mixed up and neither were the seedlings.
This one shows how dark the stems are
This pod is on the same plant
and this one
and this one and there are a few more and heaps of flowers
This one shows how dark the stems are
This pod is on the same plant
and this one
and this one and there are a few more and heaps of flowers