found this info at rollitup.org in their grow FAQ for red or purpling stems....
5) Leaves are dark green or red/purple. Stems and petioles may have purple & red on them. Leaves may turn yellow or curl under. Leaf may drop easily. Growth may be slow and leaves may be small. >> Phosphorus(P) deficiency.

I do hope this helps

Nim
Nimbliez Reviewed by Nimbliez on . Plant trouble - please help I've attached some pictures here in hopes of getting some advice. I've noticed some yellowing on the leafs and now I have this strange, red/purple going on with the stems. I posted the yellowing pics in another thread and I'm not having much luck...where is stinkyattic when I need some advice!? :question: Rating: 5