Well purplish stems on the fan leaves are normal.
It means that leaf cdan not take anymore nutes.
It is full and not taking anymore food up.
If your stem is purple and it isn't because it's purple strain.
Then you got a nute deficency or a ph problem like KNowm said.
Jdog7000 Reviewed by Jdog7000 on . red/purple veins i have read, so please do not tell me to go and read.. i just want to know what some of the other growers thought red veins was caused from, and how to cure? b/c i've got them!! Rating: 5