over here in the outdoor growing forum we only use the best light there is bro "the sun"If your growing with CFL's they do that alot.
Hey brother, above me ^ Caught my eye, iv also got the same thing, and thinking the same thing, how did your plants turn out? Was it a problem?ive got purple lines going all the way up the main stem and every bottom stem is purple i just figgured it was somthing that happens naturally.