Purple striped stem?

What does a purple striped stem mean?

You need phosphorus and a little bit of potassium most likely.

Well, it was purple ever since it was a baby so idk. It's not all purple and it's a kind of shaded medium dark purple. A little is on the node too, but barely visible.

cancer, is what it means.

id say its just tepm probs.
my stems turn red and purple depending on the temps.
i wouldnt worry.
pics would help?.
got any>?.

one of my plants also has that, it cant be temp and only 1 out of my 4 plants has purple stripes and purple centers of the leaves...is it just the strain?