RED STEMS CAN BE CAUSED BY THE ROOM BEING TO COLD AS WELL,WHAT'S YOUR TEMP LIKE,BUT IN A LOT OF STRAIN'S REDISH-PURPLE STEM'S ARE QUITE NORMAL,MY JOCK HORROR HAS A REDISH-PURPLE STEM AN SHE'S DOING JUST FINE AN DANDY,BUDDING ALL OVER THE PLACE! LOVE AN RESPECT..SPLIFFBUILDER