what would make your plants stems turn purple during vegi growth stage. i know that one of my seeds was purple kong, but what makes it purple?is it a nutrient def? light maybe?
im sorry, i just re-read your post and saw that i overlooked the fact that you were specifically asking about pupling of the stem. anyways, it is still common, and could be completely normal, but there is a condition (believe it is nute related) that has something to do with purple/red stems. post a pic, im sure someone will be able to help you out.
there should be some pics in my journal if not hang on im about to post my new pics and ill go take one really quick. remember im using cfls. link to my journal should be in my quote